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-This is groff, produced by makeinfo version 4.3d from ./groff.texinfo.
-
-This manual documents GNU `troff' version 1.19.
-
- Copyright (C) 1994-2000, 2001, 2002, 2003 Free Software Foundation,
-Inc.
-
- Permission is granted to copy, distribute and/or modify this
- document under the terms of the GNU Free Documentation License,
- Version 1.1 or any later version published by the Free Software
- Foundation; with no Invariant Sections, with the Front-Cover texts
- being `A GNU Manual," and with the Back-Cover Texts as in (a)
- below. A copy of the license is included in the section entitled
- `GNU Free Documentation License."
-
- (a) The FSF's Back-Cover Text is: `You have freedom to copy and
- modify this GNU Manual, like GNU software. Copies published by
- the Free Software Foundation raise funds for GNU development."
-
-INFO-DIR-SECTION Typesetting
-START-INFO-DIR-ENTRY
-* Groff: (groff). The GNU troff document formatting system.
-END-INFO-DIR-ENTRY
-
-
-File: groff, Node: Concept Index, Prev: Program and File Index, Up: Top
-
-Concept Index
-*************
-
-* Menu:
-
-* ", at end of sentence <1>: Using Symbols.
-* ", at end of sentence: Sentences.
-* ", in a macro argument: Request and Macro Arguments.
-* %, as delimiter: Escapes.
-* &, as delimiter: Escapes.
-* ', as a comment: Comments.
-* ', at end of sentence <1>: Using Symbols.
-* ', at end of sentence: Sentences.
-* ', delimiting arguments: Escapes.
-* (, as delimiter: Escapes.
-* (, starting a two-character identifier <1>: Escapes.
-* (, starting a two-character identifier: Identifiers.
-* ), as delimiter: Escapes.
-* ), at end of sentence <1>: Using Symbols.
-* ), at end of sentence: Sentences.
-* *, as delimiter: Escapes.
-* *, at end of sentence <1>: Using Symbols.
-* *, at end of sentence: Sentences.
-* +, and page motion: Expressions.
-* +, as delimiter: Escapes.
-* -, and page motion: Expressions.
-* -, as delimiter: Escapes.
-* ., as delimiter: Escapes.
-* .h register, difference to nl: Diversions.
-* .ps register, in comparison with .psr: Fractional Type Sizes.
-* .s register, in comparison with .sr: Fractional Type Sizes.
-* .S register, Plan 9 alias for .tabs: Tabs and Fields.
-* .t register, and diversions: Diversion Traps.
-* .tabs register, Plan 9 alias (.S): Tabs and Fields.
-* .V register, and vs: Changing Type Sizes.
-* /, as delimiter: Escapes.
-* 8-bit input: Font File Format.
-* <, as delimiter: Escapes.
-* <colon>, as delimiter: Escapes.
-* =, as delimiter: Escapes.
-* >, as delimiter: Escapes.
-* [, macro names starting with, and refer: Identifiers.
-* [, starting an identifier <1>: Escapes.
-* [, starting an identifier: Identifiers.
-* \!, and output: Diversions.
-* \!, and trnt: Character Translations.
-* \!, in top-level diversion: Diversions.
-* \!, incompatibilities with AT&T troff: Implementation Differences.
-* \!, used as delimiter: Escapes.
-* \$, when reading text for a macro: Copy-in Mode.
-* \%, and translations: Character Translations.
-* \%, following \X or \Y: Manipulating Hyphenation.
-* \%, in \X: Postprocessor Access.
-* \%, incompatibilities with AT&T troff: Implementation Differences.
-* \%, used as delimiter: Escapes.
-* \&, and glyph definitions: Using Symbols.
-* \&, and translations: Character Translations.
-* \&, at end of sentence: Sentences.
-* \&, escaping control characters: Requests.
-* \&, in \X: Postprocessor Access.
-* \&, incompatibilities with AT&T troff: Implementation Differences.
-* \&, used as delimiter: Escapes.
-* \', and translations: Character Translations.
-* \', incompatibilities with AT&T troff: Implementation Differences.
-* \', used as delimiter: Escapes.
-* \(, and translations: Character Translations.
-* \), in \X: Postprocessor Access.
-* \), used as delimiter: Escapes.
-* \*, and warnings: Warnings.
-* \*, incompatibilities with AT&T troff: Implementation Differences.
-* \*, when reading text for a macro: Copy-in Mode.
-* \, disabling (eo): Character Translations.
-* \,, used as delimiter: Escapes.
-* \-, and translations: Character Translations.
-* \-, incompatibilities with AT&T troff: Implementation Differences.
-* \-, used as delimiter: Escapes.
-* \/, used as delimiter: Escapes.
-* \0, used as delimiter: Escapes.
-* \<colon>, in \X: Postprocessor Access.
-* \<colon>, used as delimiter: Escapes.
-* \<RET>, when reading text for a macro: Copy-in Mode.
-* \<SP>, difference to \~: Request and Macro Arguments.
-* \<SP>, incompatibilities with AT&T troff: Implementation Differences.
-* \<SP>, used as delimiter: Escapes.
-* \?, in top-level diversion: Diversions.
-* \?, incompatibilities with AT&T troff: Implementation Differences.
-* \?, used as delimiter: Escapes.
-* \@, used as delimiter: Escapes.
-* \[, and translations: Character Translations.
-* \\, when reading text for a macro: Copy-in Mode.
-* \^, incompatibilities with AT&T troff: Implementation Differences.
-* \^, used as delimiter: Escapes.
-* \_, and translations: Character Translations.
-* \_, incompatibilities with AT&T troff: Implementation Differences.
-* \_, used as delimiter: Escapes.
-* \`, and translations: Character Translations.
-* \`, incompatibilities with AT&T troff: Implementation Differences.
-* \`, used as delimiter: Escapes.
-* \A, allowed delimiters: Escapes.
-* \a, and translations: Character Translations.
-* \A, incompatibilities with AT&T troff: Implementation Differences.
-* \a, used as delimiter: Escapes.
-* \B, allowed delimiters: Escapes.
-* \b, limitations: Drawing Requests.
-* \b, possible quote characters: Escapes.
-* \C, allowed delimiters: Escapes.
-* \c, and fill mode: Line Control.
-* \c, and no-fill mode: Line Control.
-* \C, and translations: Character Translations.
-* \c, incompatibilities with AT&T troff: Implementation Differences.
-* \c, used as delimiter: Escapes.
-* \D'f ...' and horizontal resolution: Drawing Requests.
-* \D, allowed delimiters: Escapes.
-* \d, used as delimiter: Escapes.
-* \e, and glyph definitions: Using Symbols.
-* \e, and translations: Character Translations.
-* \e, incompatibilities with AT&T troff: Implementation Differences.
-* \e, used as delimiter: Escapes.
-* \E, used as delimiter: Escapes.
-* \e, used as delimiter: Escapes.
-* \F, and changing fonts: Changing Fonts.
-* \F, and font positions: Font Positions.
-* \f, and font translations: Changing Fonts.
-* \f, incompatibilities with AT&T troff: Implementation Differences.
-* \H, allowed delimiters: Escapes.
-* \h, allowed delimiters: Escapes.
-* \H, incompatibilities with AT&T troff: Implementation Differences.
-* \H, using + and -: Expressions.
-* \H, with fractional type sizes: Fractional Type Sizes.
-* \L, allowed delimiters: Escapes.
-* \l, allowed delimiters: Escapes.
-* \L, and glyph definitions: Using Symbols.
-* \l, and glyph definitions: Using Symbols.
-* \N, allowed delimiters: Escapes.
-* \N, and translations: Character Translations.
-* \n, and warnings: Warnings.
-* \n, incompatibilities with AT&T troff: Implementation Differences.
-* \n, when reading text for a macro: Copy-in Mode.
-* \o, possible quote characters: Escapes.
-* \p, used as delimiter: Escapes.
-* \R, after \c: Line Control.
-* \R, allowed delimiters: Escapes.
-* \R, and warnings: Warnings.
-* \R, difference to nr: Auto-increment.
-* \r, used as delimiter: Escapes.
-* \R, using + and -: Expressions.
-* \S, allowed delimiters: Escapes.
-* \s, allowed delimiters: Escapes.
-* \S, incompatibilities with AT&T troff: Implementation Differences.
-* \s, incompatibilities with AT&T troff: Implementation Differences.
-* \s, using + and -: Expressions.
-* \s, with fractional type sizes: Fractional Type Sizes.
-* \t, and translations: Character Translations.
-* \t, and warnings: Warnings.
-* \t, used as delimiter: Escapes.
-* \u, used as delimiter: Escapes.
-* \v, allowed delimiters: Escapes.
-* \v, internal representation: Gtroff Internals.
-* \w, allowed delimiters: Escapes.
-* \x, allowed delimiters: Escapes.
-* \X, and special characters: Postprocessor Access.
-* \X, followed by \%: Manipulating Hyphenation.
-* \X, possible quote characters: Escapes.
-* \Y, followed by \%: Manipulating Hyphenation.
-* \Z, allowed delimiters: Escapes.
-* \{, incompatibilities with AT&T troff: Implementation Differences.
-* \{, used as delimiter: Escapes.
-* \|, incompatibilities with AT&T troff: Implementation Differences.
-* \|, used as delimiter: Escapes.
-* \}, and warnings: Warnings.
-* \}, incompatibilities with AT&T troff: Implementation Differences.
-* \}, used as delimiter: Escapes.
-* \~, and translations: Character Translations.
-* \~, difference to \<SP>: Request and Macro Arguments.
-* \~, used as delimiter: Escapes.
-* ], as part of an identifier: Identifiers.
-* ], at end of sentence <1>: Using Symbols.
-* ], at end of sentence: Sentences.
-* ], ending an identifier <1>: Escapes.
-* ], ending an identifier: Identifiers.
-* ], macro names starting with, and refer: Identifiers.
-* aborting (ab): Debugging.
-* absolute position operator (|): Expressions.
-* accent marks [ms]: ms Strings and Special Characters.
-* access of postprocessor: Postprocessor Access.
-* accessing unnamed glyphs with \N: Font File Format.
-* activating kerning (kern): Ligatures and Kerning.
-* activating ligatures (lg): Ligatures and Kerning.
-* activating track kerning (tkf): Ligatures and Kerning.
-* ad request, and hyphenation margin: Manipulating Hyphenation.
-* ad request, and hyphenation space: Manipulating Hyphenation.
-* adjusting: Filling and Adjusting.
-* adjusting and filling, manipulating: Manipulating Filling and Adjusting.
-* adjustment mode register (.j): Manipulating Filling and Adjusting.
-* adobe glyph list (AGL): Using Symbols.
-* AGL (adobe glyph list): Using Symbols.
-* alias, diversion, creating (als): Strings.
-* alias, macro, creating (als): Strings.
-* alias, number register, creating (aln): Setting Registers.
-* alias, string, creating (als): Strings.
-* als request, and \$0: Parameters.
-* am, am1, ami requests, and warnings: Warnings.
-* annotations: Footnotes and Annotations.
-* appending to a diversion (da): Diversions.
-* appending to a file (opena): I/O.
-* appending to a macro (am): Writing Macros.
-* appending to a string (as): Strings.
-* arc, drawing (\D'a ...'): Drawing Requests.
-* argument delimiting characters: Escapes.
-* arguments to requests and macros: Request and Macro Arguments.
-* arguments, macro (\$): Parameters.
-* arguments, of strings: Strings.
-* arithmetic operators: Expressions.
-* artificial fonts: Artificial Fonts.
-* as, as1 requests, and comments: Comments.
-* as, as1 requests, and warnings: Warnings.
-* ASCII approximation output register (.A) <1>: Built-in Registers.
-* ASCII approximation output register (.A): Groff Options.
-* ASCII, output encoding: Groff Options.
-* asciify request, and writem: I/O.
-* assigning formats (af): Assigning Formats.
-* assignments, indirect: Interpolating Registers.
-* assignments, nested: Interpolating Registers.
-* AT&T troff, ms macro package differences: Differences from AT&T ms.
-* auto-increment: Auto-increment.
-* available glyphs, list (`groff_char(7)' man page): Using Symbols.
-* backslash, printing (\\, \e, \E, \[rs]) <1>: Implementation Differences.
-* backslash, printing (\\, \e, \E, \[rs]): Escapes.
-* backspace character: Identifiers.
-* backspace character, and translations: Character Translations.
-* backtrace of input stack (backtrace): Debugging.
-* baseline: Sizes.
-* basic unit (u): Measurements.
-* basics of macros: Basics.
-* bd request, and font styles: Font Families.
-* bd request, and font translations: Changing Fonts.
-* bd request, incompatibilities with AT&T troff: Implementation Differences.
-* begin of conditional block (\{): if-else.
-* beginning diversion (di): Diversions.
-* blank line <1>: Requests.
-* blank line: Implicit Line Breaks.
-* blank line (sp): Basics.
-* blank line macro (blm) <1>: Blank Line Traps.
-* blank line macro (blm) <2>: Requests.
-* blank line macro (blm): Implicit Line Breaks.
-* blank line traps: Blank Line Traps.
-* blank lines, disabling: Manipulating Spacing.
-* block, conditional, begin (\{): if-else.
-* block, condititional, end (\}): if-else.
-* bold face [man]: Man font macros.
-* bold face, imitating (bd): Artificial Fonts.
-* bottom margin: Page Layout.
-* bounding box: Miscellaneous.
-* box rule glyph (\[br]): Drawing Requests.
-* box, boxa requests, and warnings: Warnings.
-* boxa request, and dn (dl): Diversions.
-* bp request, and top-level diversion: Page Control.
-* bp request, and traps (.pe): Page Location Traps.
-* bp request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* bp request, using + and -: Expressions.
-* br glyph, and cflags: Using Symbols.
-* break <1>: Manipulating Filling and Adjusting.
-* break: Basics.
-* break (br): Basics.
-* break request, in a while loop: while.
-* break, implicit: Implicit Line Breaks.
-* built-in registers: Built-in Registers.
-* bulleted list, example markup [ms]: Lists in ms.
-* c unit: Measurements.
-* calling convention of preprocessors: Preprocessors in man pages.
-* capabilities of groff: groff Capabilities.
-* ce request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* ce request, difference to .ad c: Manipulating Filling and Adjusting.
-* centered text: Manipulating Filling and Adjusting.
-* centering lines (ce) <1>: Manipulating Filling and Adjusting.
-* centering lines (ce): Basics.
-* centimeter unit (c): Measurements.
-* cf request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* changing font family (fam, \F): Font Families.
-* changing font position (\f): Font Positions.
-* changing font style (sty): Font Families.
-* changing fonts (ft, \f): Changing Fonts.
-* changing format, and read-only registers: Assigning Formats.
-* changing the font height (\H): Artificial Fonts.
-* changing the font slant (\S): Artificial Fonts.
-* changing the page number character (pc): Page Layout.
-* changing trap location (ch): Page Location Traps.
-* changing type sizes (ps, \s): Changing Type Sizes.
-* changing vertical line spacing (vs): Changing Type Sizes.
-* char request, and soft hyphen character: Manipulating Hyphenation.
-* char request, and translations: Character Translations.
-* char request, used with \N: Using Symbols.
-* character: Using Symbols.
-* character properties (cflags): Using Symbols.
-* character translations: Character Translations.
-* character, backspace: Identifiers.
-* character, backspace, and translations: Character Translations.
-* character, control (.): Requests.
-* character, control, changing (cc): Character Translations.
-* character, defining (char): Using Symbols.
-* character, defining fallback (fchar, fschar, schar): Using Symbols.
-* character, escape, changing (ec): Character Translations.
-* character, escape, while defining glyph: Using Symbols.
-* character, field delimiting (fc): Fields.
-* character, field padding (fc): Fields.
-* character, hyphenation (\%): Manipulating Hyphenation.
-* character, leader repetition (lc): Leaders.
-* character, leader, and translations: Character Translations.
-* character, leader, non-interpreted (\a): Leaders.
-* character, named (\C): Using Symbols.
-* character, newline: Escapes.
-* character, newline, and translations: Character Translations.
-* character, no-break control ('): Requests.
-* character, no-break control, changing (c2): Character Translations.
-* character, soft hyphen, setting (shc): Manipulating Hyphenation.
-* character, space: Escapes.
-* character, special: Character Translations.
-* character, tab: Escapes.
-* character, tab repetition (tc): Tabs and Fields.
-* character, tab, and translations: Character Translations.
-* character, tab, non-interpreted (\t): Tabs and Fields.
-* character, tabulator: Tab Stops.
-* character, transparent <1>: Using Symbols.
-* character, transparent: Sentences.
-* character, whitespace: Identifiers.
-* character, zero width space (\&) <1>: Drawing Requests.
-* character, zero width space (\&) <2>: Ligatures and Kerning.
-* character, zero width space (\&): Requests.
-* characters, argument delimiting: Escapes.
-* characters, end-of-sentence: Using Symbols.
-* characters, hyphenation: Using Symbols.
-* characters, input, and output glyphs, compatibility with AT&T troff: Implementation Differences.
-* characters, invalid for trf request: I/O.
-* characters, invalid input: Identifiers.
-* characters, overlapping: Using Symbols.
-* characters, special: Special Characters.
-* characters, unnamed, accessing with \N: Font File Format.
-* circle, drawing (\D'c ...'): Drawing Requests.
-* circle, solid, drawing (\D'C ...'): Drawing Requests.
-* closing file (close): I/O.
-* code, hyphenation (hcode): Manipulating Hyphenation.
-* color, default: Colors.
-* colors: Colors.
-* colors, fill, unnamed (\D'F...'): Drawing Requests.
-* command prefix: Environment.
-* command-line options: Groff Options.
-* commands, embedded: Embedded Commands.
-* comments: Comments.
-* comments in font files: Font File Format.
-* comments, lining up with tabs: Comments.
-* comments, with ds: Strings.
-* common features: Common Features.
-* common name space of macros, diversions, and strings: Strings.
-* comparison operators: Expressions.
-* compatibility mode <1>: Implementation Differences.
-* compatibility mode: Warnings.
-* composite glyph names: Using Symbols.
-* conditional block, begin (\{): if-else.
-* conditional block, end (\}): if-else.
-* conditional page break (ne): Page Control.
-* conditionals and loops: Conditionals and Loops.
-* consecutive hyphenated lines (hlm): Manipulating Hyphenation.
-* constant glyph space mode (cs): Artificial Fonts.
-* contents, table of <1>: Leaders.
-* contents, table of: Table of Contents.
-* continuation, input line (\): Line Control.
-* continuation, output line (\c): Line Control.
-* continue request, in a while loop: while.
-* continuous underlining (cu): Artificial Fonts.
-* control character (.): Requests.
-* control character, changing (cc): Character Translations.
-* control character, no-break ('): Requests.
-* control character, no-break, changing (c2): Character Translations.
-* control, line: Line Control.
-* control, page: Page Control.
-* conventions for input: Input Conventions.
-* copy-in mode: Copy-in Mode.
-* copy-in mode, and macro arguments: Parameters.
-* copy-in mode, and write requests: I/O.
-* copying environment (evc): Environments.
-* correction between italic and roman glyph (\/, \,): Ligatures and Kerning.
-* correction, italic (\/): Ligatures and Kerning.
-* correction, left italic (\,): Ligatures and Kerning.
-* cover page macros, [ms]: ms Cover Page Macros.
-* cp request, and glyph definitions: Using Symbols.
-* cp1047, input encoding: Input Encodings.
-* cp1047, output encoding: Groff Options.
-* creating alias, for diversion (als): Strings.
-* creating alias, for macro (als): Strings.
-* creating alias, for number register (aln): Setting Registers.
-* creating alias, for string (als): Strings.
-* creating new characters (char): Using Symbols.
-* credits: Credits.
-* cs request, and font styles: Font Families.
-* cs request, and font translations: Changing Fonts.
-* cs request, incompatibilities with AT&T troff: Implementation Differences.
-* cs request, with fractional type sizes: Fractional Type Sizes.
-* current directory: Macro Directories.
-* current input file name register (.F): Built-in Registers.
-* current time: I/O.
-* current time, hours (hours): Built-in Registers.
-* current time, minutes (minutes): Built-in Registers.
-* current time, seconds (seconds): Built-in Registers.
-* da request, and dn (dl): Diversions.
-* da request, and warnings: Warnings.
-* date, day of the month register (dy): Built-in Registers.
-* date, day of the week register (dw): Built-in Registers.
-* date, month of the year register (mo): Built-in Registers.
-* date, year register (year, yr): Built-in Registers.
-* day of the month register (dy): Built-in Registers.
-* day of the week register (dw): Built-in Registers.
-* de request, and while: while.
-* de, de1, dei requests, and warnings: Warnings.
-* debugging: Debugging.
-* default color: Colors.
-* default indentation [man]: Miscellaneous man macros.
-* default indentation, resetting [man]: Man usage.
-* default units: Default Units.
-* defining character (char): Using Symbols.
-* defining fallback character (fchar, fschar, schar): Using Symbols.
-* defining glyph (char): Using Symbols.
-* defining symbol (char): Using Symbols.
-* delayed text: Footnotes and Annotations.
-* delimited arguments, incompatibilities with AT&T troff: Implementation Differences.
-* delimiting character, for fields (fc): Fields.
-* delimiting characters for arguments: Escapes.
-* depth, of last glyph (.cdp): Environments.
-* DESC file, format: DESC File Format.
-* device resolution: DESC File Format.
-* devices for output <1>: Output Devices.
-* devices for output: Output device intro.
-* dg glyph, at end of sentence <1>: Using Symbols.
-* dg glyph, at end of sentence: Sentences.
-* di request, and warnings: Warnings.
-* differences in implementation: Implementation Differences.
-* digit width space (\0): Page Motions.
-* digits, and delimiters: Escapes.
-* dimensions, line: Line Layout.
-* directories for fonts: Font Directories.
-* directories for macros: Macro Directories.
-* directory, current: Macro Directories.
-* directory, for tmac files: Macro Directories.
-* directory, home: Macro Directories.
-* directory, platform-specific: Macro Directories.
-* directory, site-specific <1>: Font Directories.
-* directory, site-specific: Macro Directories.
-* disabling \ (eo): Character Translations.
-* disabling hyphenation (\%): Manipulating Hyphenation.
-* discardable horizontal space: Manipulating Filling and Adjusting.
-* discarded space in traps: Manipulating Spacing.
-* displays: Displays.
-* displays [ms]: ms Displays and Keeps.
-* distance to next trap register (.t): Page Location Traps.
-* ditroff, the program: History.
-* diversion name register (.z): Diversions.
-* diversion trap, setting (dt): Diversion Traps.
-* diversion traps: Diversion Traps.
-* diversion, appending (da): Diversions.
-* diversion, beginning (di): Diversions.
-* diversion, creating alias (als): Strings.
-* diversion, ending (di): Diversions.
-* diversion, nested: Diversions.
-* diversion, removing (rm): Strings.
-* diversion, renaming (rn): Strings.
-* diversion, stripping final newline: Strings.
-* diversion, top-level: Diversions.
-* diversion, top-level, and \!: Diversions.
-* diversion, top-level, and \?: Diversions.
-* diversion, top-level, and bp: Page Control.
-* diversion, unformatting (asciify): Diversions.
-* diversion, vertical position in, register (.d): Diversions.
-* diversions: Diversions.
-* diversions, and traps: Page Location Traps.
-* diversions, shared name space with macros and strings: Strings.
-* dl register, and da (boxa): Diversions.
-* dn register, and da (boxa): Diversions.
-* documents, multi-file: Debugging.
-* documents, structuring the source code: Requests.
-* double quote, in a macro argument: Request and Macro Arguments.
-* double-spacing (ls) <1>: Manipulating Spacing.
-* double-spacing (ls): Basics.
-* double-spacing (vs, pvs): Changing Type Sizes.
-* drawing a circle (\D'c ...'): Drawing Requests.
-* drawing a line (\D'l ...'): Drawing Requests.
-* drawing a polygon (\D'p ...'): Drawing Requests.
-* drawing a solid circle (\D'C ...'): Drawing Requests.
-* drawing a solid ellipse (\D'E ...'): Drawing Requests.
-* drawing a solid polygon (\D'P ...'): Drawing Requests.
-* drawing a spline (\D'~ ...'): Drawing Requests.
-* drawing an arc (\D'a ...'): Drawing Requests.
-* drawing an ellipse (\D'e ...'): Drawing Requests.
-* drawing horizontal lines (\l): Drawing Requests.
-* drawing requests: Drawing Requests.
-* drawing vertical lines (\L): Drawing Requests.
-* ds request, and comments: Strings.
-* ds request, and double quotes: Request and Macro Arguments.
-* ds request, and leading spaces: Strings.
-* ds, ds1 requests, and comments: Comments.
-* ds, ds1 requests, and warnings: Warnings.
-* dumping number registers (pnr): Debugging.
-* dumping symbol table (pm): Debugging.
-* dumping traps (ptr): Debugging.
-* EBCDIC encoding: Tab Stops.
-* EBCDIC encoding of a tab: Tabs and Fields.
-* EBCDIC encoding of backspace: Identifiers.
-* EBCDIC, input encoding: Input Encodings.
-* EBCDIC, output encoding: Groff Options.
-* el request, and warnings: Warnings.
-* ellipse, drawing (\D'e ...'): Drawing Requests.
-* ellipse, solid, drawing (\D'E ...'): Drawing Requests.
-* em glyph, and cflags: Using Symbols.
-* em unit (m): Measurements.
-* embedded commands: Embedded Commands.
-* embedding PostScript: Embedding PostScript.
-* embolding of special fonts: Artificial Fonts.
-* empty line: Implicit Line Breaks.
-* empty line (sp): Basics.
-* empty space before a paragraph [man]: Miscellaneous man macros.
-* en unit (n): Measurements.
-* enabling vertical position traps (vpt): Page Location Traps.
-* encoding, EBCDIC: Tab Stops.
-* encoding, input, cp1047: Input Encodings.
-* encoding, input, EBCDIC: Input Encodings.
-* encoding, input, latin-1 (ISO 8859-1): Input Encodings.
-* encoding, input, latin-2 (ISO 8859-2): Input Encodings.
-* encoding, input, latin-9 (latin-0, ISO 8859-15): Input Encodings.
-* encoding, output, ASCII: Groff Options.
-* encoding, output, cp1047: Groff Options.
-* encoding, output, EBCDIC: Groff Options.
-* encoding, output, latin-1 (ISO 8859-1): Groff Options.
-* encoding, output, utf-8: Groff Options.
-* end of conditional block (\}): if-else.
-* end-of-input macro (em): End-of-input Traps.
-* end-of-input trap, setting (em): End-of-input Traps.
-* end-of-input traps: End-of-input Traps.
-* end-of-sentence characters: Using Symbols.
-* ending diversion (di): Diversions.
-* environment number/name register (.ev): Environments.
-* environment variables: Environment.
-* environment, copying (evc): Environments.
-* environment, dimensions of last glyph (.w, .cht, .cdp, .csk): Environments.
-* environment, previous line length (.n): Environments.
-* environment, switching (ev): Environments.
-* environments: Environments.
-* eqn, the program: geqn.
-* equations [ms]: ms Insertions.
-* escape character, changing (ec): Character Translations.
-* escape character, while defining glyph: Using Symbols.
-* escapes: Escapes.
-* escaping newline characters, in strings: Strings.
-* ex request, use in debugging: Debugging.
-* ex request, used with nx and rd: I/O.
-* example markup, bulleted list [ms]: Lists in ms.
-* example markup, glossary-style list [ms]: Lists in ms.
-* example markup, multi-page table [ms]: Example multi-page table.
-* example markup, numbered list [ms]: Lists in ms.
-* example markup, title page: ms Cover Page Macros.
-* examples of invocation: Invocation Examples.
-* exiting (ex): Debugging.
-* expansion of strings (\*): Strings.
-* explicit hyphen (\%): Manipulating Hyphenation.
-* expression, order of evaluation: Expressions.
-* expressions: Expressions.
-* expressions, and space characters: Expressions.
-* extra post-vertical line space (\x): Changing Type Sizes.
-* extra post-vertical line space register (.a): Manipulating Spacing.
-* extra pre-vertical line space (\x): Changing Type Sizes.
-* extra spaces: Filling and Adjusting.
-* extremum operators (>?, <?): Expressions.
-* f unit: Measurements.
-* f unit, and colors: Colors.
-* fallback character, defining (fchar, fschar, schar): Using Symbols.
-* fallback glyph, removing definition (rchar, rfschar): Using Symbols.
-* fam request, and changing fonts: Changing Fonts.
-* fam request, and font positions: Font Positions.
-* families, font: Font Families.
-* FDL, GNU Free Documentation License: GNU Free Documentation License.
-* features, common: Common Features.
-* fi request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* field delimiting character (fc): Fields.
-* field padding character (fc): Fields.
-* fields: Fields.
-* fields, and tabs: Tabs and Fields.
-* figures [ms]: ms Insertions.
-* file formats: File formats.
-* file, appending to (opena): I/O.
-* file, closing (close): I/O.
-* file, inclusion (so): I/O.
-* file, opening (open): I/O.
-* file, processing next (nx): I/O.
-* file, writing to (write): I/O.
-* files, font: Font Files.
-* files, macro, searching: Macro Directories.
-* fill colors, unnamed (\D'F...'): Drawing Requests.
-* fill mode <1>: Warnings.
-* fill mode <2>: Manipulating Filling and Adjusting.
-* fill mode: Implicit Line Breaks.
-* fill mode (fi): Manipulating Filling and Adjusting.
-* fill mode, and \c: Line Control.
-* filling: Filling and Adjusting.
-* filling and adjusting, manipulating: Manipulating Filling and Adjusting.
-* final newline, stripping in diversions: Strings.
-* fl request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* floating keep: Displays.
-* flush output (fl): Debugging.
-* font description file, format <1>: Font File Format.
-* font description file, format: DESC File Format.
-* font directories: Font Directories.
-* font families: Font Families.
-* font family, changing (fam, \F): Font Families.
-* font file, format: Font File Format.
-* font files: Font Files.
-* font files, comments: Font File Format.
-* font for underlining (uf): Artificial Fonts.
-* font height, changing (\H): Artificial Fonts.
-* font path: Font Directories.
-* font position register (.f): Font Positions.
-* font position, changing (\f): Font Positions.
-* font positions: Font Positions.
-* font selection [man]: Man font macros.
-* font slant, changing (\S): Artificial Fonts.
-* font style, changing (sty): Font Families.
-* font styles: Font Families.
-* font, mounting (fp): Font Positions.
-* font, previous (ft, \f[], \fP): Changing Fonts.
-* fonts <1>: Changing Fonts.
-* fonts: Fonts and Symbols.
-* fonts, artificial: Artificial Fonts.
-* fonts, changing (ft, \f): Changing Fonts.
-* fonts, PostScript: Font Families.
-* fonts, searching: Font Directories.
-* fonts, special: Special Fonts.
-* footers <1>: Page Location Traps.
-* footers: Page Layout.
-* footers [ms]: ms Headers and Footers.
-* footnotes: Footnotes and Annotations.
-* footnotes [ms]: ms Footnotes.
-* form letters: I/O.
-* format of font description file: DESC File Format.
-* format of font description files: Font File Format.
-* format of font files: Font File Format.
-* format of register (\g): Assigning Formats.
-* formats, assigning (af): Assigning Formats.
-* formats, file: File formats.
-* fp request, and font translations: Changing Fonts.
-* fp request, incompatibilities with AT&T troff: Implementation Differences.
-* fractional point sizes <1>: Implementation Differences.
-* fractional point sizes: Fractional Type Sizes.
-* fractional type sizes <1>: Implementation Differences.
-* fractional type sizes: Fractional Type Sizes.
-* french-spacing: Sentences.
-* fspecial request, and font styles: Font Families.
-* fspecial request, and font translations: Changing Fonts.
-* fspecial request, and glyph search order: Using Symbols.
-* fspecial request, and imitating bold: Artificial Fonts.
-* ft request, and font translations: Changing Fonts.
-* geqn, invoking: Invoking geqn.
-* geqn, the program: geqn.
-* GGL (groff glyph list): Using Symbols.
-* ggrn, invoking: Invoking ggrn.
-* ggrn, the program: ggrn.
-* glossary-style list, example markup [ms]: Lists in ms.
-* glyph: Using Symbols.
-* glyph for line drawing: Drawing Requests.
-* glyph names, composite: Using Symbols.
-* glyph pile (\b): Drawing Requests.
-* glyph properties (cflags): Using Symbols.
-* glyph, box rule (\[br]): Drawing Requests.
-* glyph, constant space: Artificial Fonts.
-* glyph, defining (char): Using Symbols.
-* glyph, for line drawing: Drawing Requests.
-* glyph, for margins (mc): Miscellaneous.
-* glyph, italic correction (\/): Ligatures and Kerning.
-* glyph, last, dimensions (.w, .cht, .cdp, .csk): Environments.
-* glyph, leader repetition (lc): Leaders.
-* glyph, left italic correction (\,): Ligatures and Kerning.
-* glyph, numbered (\N) <1>: Using Symbols.
-* glyph, numbered (\N): Character Translations.
-* glyph, removing definition (rchar, rfschar): Using Symbols.
-* glyph, soft hyphen (hy): Manipulating Hyphenation.
-* glyph, tab repetition (tc): Tabs and Fields.
-* glyph, underscore (\[ru]): Drawing Requests.
-* glyphs, available, list (`groff_char(7)' man page): Using Symbols.
-* glyphs, output, and input characters, compatibility with AT&T troff: Implementation Differences.
-* glyphs, overstriking (\o): Page Motions.
-* glyphs, unnamed: Using Symbols.
-* glyphs, unnamed, accessing with \N: Font File Format.
-* GNU-specific register (.g): Built-in Registers.
-* gpic, invoking: Invoking gpic.
-* gpic, the program: gpic.
-* grap, the program: grap.
-* gray shading (\D'f ...'): Drawing Requests.
-* grefer, invoking: Invoking grefer.
-* grefer, the program: grefer.
-* grn, the program: ggrn.
-* grodvi, invoking: Invoking grodvi.
-* grodvi, the program: grodvi.
-* groff - what is it?: What Is groff?.
-* groff capabilities: groff Capabilities.
-* groff glyph list (GGL): Using Symbols.
-* groff invocation: Invoking groff.
-* groff, and pi request: I/O.
-* GROFF_BIN_PATH, environment variable: Environment.
-* GROFF_COMMAND_PREFIX, environment variable: Environment.
-* GROFF_FONT_PATH, environment variable <1>: Font Directories.
-* GROFF_FONT_PATH, environment variable: Environment.
-* GROFF_TMAC_PATH, environment variable <1>: Macro Directories.
-* GROFF_TMAC_PATH, environment variable: Environment.
-* GROFF_TMPDIR, environment variable: Environment.
-* GROFF_TYPESETTER, environment variable: Environment.
-* grohtml, invoking: Invoking grohtml.
-* grohtml, registers and strings: grohtml specific registers and strings.
-* grohtml, the program <1>: grohtml.
-* grohtml, the program: Groff Options.
-* grolbp, invoking: Invoking grolbp.
-* grolbp, the program: grolbp.
-* grolj4, invoking: Invoking grolj4.
-* grolj4, the program: grolj4.
-* grops, invoking: Invoking grops.
-* grops, the program: grops.
-* grotty, invoking: Invoking grotty.
-* grotty, the program: grotty.
-* gsoelim, invoking: Invoking gsoelim.
-* gsoelim, the program: gsoelim.
-* gtbl, invoking: Invoking gtbl.
-* gtbl, the program: gtbl.
-* gtroff, identification register (.g): Built-in Registers.
-* gtroff, interactive use: Debugging.
-* gtroff, output: gtroff Output.
-* gtroff, process ID register ($$): Built-in Registers.
-* gtroff, reference: gtroff Reference.
-* gxditview, invoking: Invoking gxditview.
-* gxditview, the program: gxditview.
-* hanging indentation [man]: Man usage.
-* hcode request, and glyph definitions: Using Symbols.
-* headers <1>: Page Location Traps.
-* headers: Page Layout.
-* headers [ms]: ms Headers and Footers.
-* height, font, changing (\H): Artificial Fonts.
-* height, of last glyph (.cht): Environments.
-* high-water mark register (.h): Diversions.
-* history: History.
-* home directory: Macro Directories.
-* horizontal discardable space: Manipulating Filling and Adjusting.
-* horizontal input line position register (hp): Page Motions.
-* horizontal input line position, saving (\k): Page Motions.
-* horizontal line, drawing (\l): Drawing Requests.
-* horizontal motion (\h): Page Motions.
-* horizontal output line position register (.k): Page Motions.
-* horizontal resolution: DESC File Format.
-* horizontal resolution register (.H): Built-in Registers.
-* horizontal space (\h): Page Motions.
-* horizontal space, unformatting: Strings.
-* hours, current time (hours): Built-in Registers.
-* hpf request, and hyphenation language: Manipulating Hyphenation.
-* hw request, and hyphenation language: Manipulating Hyphenation.
-* hy glyph, and cflags: Using Symbols.
-* hyphen, explicit (\%): Manipulating Hyphenation.
-* hyphenated lines, consecutive (hlm): Manipulating Hyphenation.
-* hyphenating characters: Using Symbols.
-* hyphenation: Hyphenation.
-* hyphenation character (\%): Manipulating Hyphenation.
-* hyphenation code (hcode): Manipulating Hyphenation.
-* hyphenation language register (.hla): Manipulating Hyphenation.
-* hyphenation margin (hym): Manipulating Hyphenation.
-* hyphenation margin register (.hym): Manipulating Hyphenation.
-* hyphenation patterns (hpf): Manipulating Hyphenation.
-* hyphenation restrictions register (.hy): Manipulating Hyphenation.
-* hyphenation space (hys): Manipulating Hyphenation.
-* hyphenation space register (.hys): Manipulating Hyphenation.
-* hyphenation, disabling (\%): Manipulating Hyphenation.
-* hyphenation, manipulating: Manipulating Hyphenation.
-* i unit: Measurements.
-* i/o: I/O.
-* IBM cp1047 input encoding: Input Encodings.
-* IBM cp1047 output encoding: Groff Options.
-* identifiers: Identifiers.
-* identifiers, undefined: Identifiers.
-* ie request, and warnings: Warnings.
-* if request, and the ! operator: Expressions.
-* if request, operators to use with: Operators in Conditionals.
-* if-else: if-else.
-* imitating bold face (bd): Artificial Fonts.
-* implementation differences: Implementation Differences.
-* implicit breaks of lines: Implicit Line Breaks.
-* implicit line breaks: Implicit Line Breaks.
-* in request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* in request, using + and -: Expressions.
-* inch unit (i): Measurements.
-* including a file (so): I/O.
-* incompatibilities with AT&T troff: Implementation Differences.
-* increment value without changing the register: Auto-increment.
-* increment, automatic: Auto-increment.
-* indentaion, resetting to default [man]: Man usage.
-* indentation (in): Line Layout.
-* index, in macro package: Indices.
-* indirect assignments: Interpolating Registers.
-* input and output requests: I/O.
-* input characters and output glyphs, compatibility with AT&T troff: Implementation Differences.
-* input characters, invalid: Identifiers.
-* input conventions: Input Conventions.
-* input encoding, cp1047: Input Encodings.
-* input encoding, EBCDIC: Input Encodings.
-* input encoding, latin-1 (ISO 8859-1): Input Encodings.
-* input encoding, latin-2 (ISO 8859-2): Input Encodings.
-* input encoding, latin-9 (latin-9, ISO 8859-15): Input Encodings.
-* input file name, current, register (.F): Built-in Registers.
-* input level in delimited arguments: Implementation Differences.
-* input line continuation (\): Line Control.
-* input line number register (.c, c.): Built-in Registers.
-* input line number, setting (lf): Debugging.
-* input line position, horizontal, saving (\k): Page Motions.
-* input line trap, setting (it): Input Line Traps.
-* input line traps: Input Line Traps.
-* input line traps and interrupted lines (itc): Input Line Traps.
-* input line, horizontal position, register (hp): Page Motions.
-* input stack, backtrace (backtrace): Debugging.
-* input stack, setting limit: Debugging.
-* input token: Gtroff Internals.
-* input, 8-bit: Font File Format.
-* input, standard, reading from (rd): I/O.
-* inserting horizontal space (\h): Page Motions.
-* installation: Installation.
-* interactive use of gtroff: Debugging.
-* intermediate output: gtroff Output.
-* interpolating registers (\n): Interpolating Registers.
-* interpolation of strings (\*): Strings.
-* interrupted line: Line Control.
-* interrupted line register (.int): Line Control.
-* interrupted lines and input line traps (itc): Input Line Traps.
-* introduction: Introduction.
-* invalid characters for trf request: I/O.
-* invalid input characters: Identifiers.
-* invocation examples: Invocation Examples.
-* invoking geqn: Invoking geqn.
-* invoking ggrn: Invoking ggrn.
-* invoking gpic: Invoking gpic.
-* invoking grefer: Invoking grefer.
-* invoking grodvi: Invoking grodvi.
-* invoking groff: Invoking groff.
-* invoking grohtml: Invoking grohtml.
-* invoking grolbp: Invoking grolbp.
-* invoking grolj4: Invoking grolj4.
-* invoking grops: Invoking grops.
-* invoking grotty: Invoking grotty.
-* invoking gsoelim: Invoking gsoelim.
-* invoking gtbl: Invoking gtbl.
-* invoking gxditview: Invoking gxditview.
-* ISO 8859-1 (latin-1), input encoding: Input Encodings.
-* ISO 8859-1 (latin-1), output encoding: Groff Options.
-* ISO 8859-15 (latin-9, latin-0), input encoding: Input Encodings.
-* ISO 8859-2 (latin-2), input encoding: Input Encodings.
-* italic correction (\/): Ligatures and Kerning.
-* italic fonts [man]: Man font macros.
-* italic glyph, correction after roman glyph (\,): Ligatures and Kerning.
-* italic glyph, correction before roman glyph (\/): Ligatures and Kerning.
-* justifying text: Manipulating Filling and Adjusting.
-* justifying text (rj): Manipulating Filling and Adjusting.
-* keep: Displays.
-* keep, floating: Displays.
-* keeps [ms]: ms Displays and Keeps.
-* kerning and ligatures: Ligatures and Kerning.
-* kerning enabled register (.kern): Ligatures and Kerning.
-* kerning, activating (kern): Ligatures and Kerning.
-* kerning, track: Ligatures and Kerning.
-* landscape page orientation: Paper Size.
-* last glyph, dimensions (.w, .cht, .cdp, .csk): Environments.
-* last-requested point size registers (.psr, .sr): Fractional Type Sizes.
-* latin-1 (ISO 8859-1), input encoding: Input Encodings.
-* latin-1 (ISO 8859-1), output encoding: Groff Options.
-* latin-2 (ISO 8859-2), input encoding: Input Encodings.
-* latin-9 (latin-0, ISO 8859-15), input encoding: Input Encodings.
-* layout, line: Line Layout.
-* layout, page: Page Layout.
-* lc request, and glyph definitions: Using Symbols.
-* leader character: Leaders.
-* leader character, and translations: Character Translations.
-* leader character, non-interpreted (\a): Leaders.
-* leader repetition character (lc): Leaders.
-* leaders: Leaders.
-* leading: Sizes.
-* leading spaces: Filling and Adjusting.
-* leading spaces with ds: Strings.
-* left italic correction (\,): Ligatures and Kerning.
-* left margin (po): Line Layout.
-* left margin, how to move [man]: Man usage.
-* length of a string (length): Strings.
-* length of line (ll): Line Layout.
-* length of page (pl): Page Layout.
-* length of previous line (.n): Environments.
-* length of title line (lt): Page Layout.
-* letters, form: I/O.
-* level of warnings (warn): Debugging.
-* ligature: Using Symbols.
-* ligatures and kerning: Ligatures and Kerning.
-* ligatures enabled register (.lg): Ligatures and Kerning.
-* ligatures, activating (lg): Ligatures and Kerning.
-* limitations of \b escape: Drawing Requests.
-* line break <1>: Manipulating Filling and Adjusting.
-* line break <2>: Implicit Line Breaks.
-* line break: Basics.
-* line break (br): Basics.
-* line breaks, with vertical space [man]: Man usage.
-* line breaks, without vertical space [man]: Man usage.
-* line control: Line Control.
-* line dimensions: Line Layout.
-* line drawing glyph: Drawing Requests.
-* line indentation (in): Line Layout.
-* line layout: Line Layout.
-* line length (ll): Line Layout.
-* line length register (.l): Line Layout.
-* line length, previous (.n): Environments.
-* line number, input, register (.c, c.): Built-in Registers.
-* line number, output, register (ln): Built-in Registers.
-* line numbers, printing (nm): Miscellaneous.
-* line space, extra post-vertical (\x): Changing Type Sizes.
-* line space, extra pre-vertical (\x): Changing Type Sizes.
-* line spacing register (.L): Manipulating Spacing.
-* line spacing, post-vertical (pvs): Changing Type Sizes.
-* line thickness (\D't ...'): Drawing Requests.
-* line, blank: Implicit Line Breaks.
-* line, drawing (\D'l ...'): Drawing Requests.
-* line, empty (sp): Basics.
-* line, horizontal, drawing (\l): Drawing Requests.
-* line, implicit breaks: Implicit Line Breaks.
-* line, input, continuation (\): Line Control.
-* line, input, horizontal position, register (hp): Page Motions.
-* line, input, horizontal position, saving (\k): Page Motions.
-* line, interrupted: Line Control.
-* line, output, continuation (\c): Line Control.
-* line, output, horizontal position, register (.k): Page Motions.
-* line, vertical, drawing (\L): Drawing Requests.
-* line-tabs mode: Tabs and Fields.
-* lines, blank, disabling: Manipulating Spacing.
-* lines, centering (ce) <1>: Manipulating Filling and Adjusting.
-* lines, centering (ce): Basics.
-* lines, consecutive hyphenated (hlm): Manipulating Hyphenation.
-* lines, interrupted, and input line traps (itc): Input Line Traps.
-* list: Displays.
-* list of available glyphs (`groff_char(7)' man page): Using Symbols.
-* ll request, using + and -: Expressions.
-* location, vertical, page, marking (mk): Page Motions.
-* location, vertical, page, returning to marked (rt): Page Motions.
-* logical operators: Expressions.
-* long names: Implementation Differences.
-* loops and conditionals: Conditionals and Loops.
-* lq glyph, and lq string [man]: Predefined man strings.
-* ls request, alternative to (pvs): Changing Type Sizes.
-* lt request, using + and -: Expressions.
-* M unit: Measurements.
-* m unit: Measurements.
-* machine unit (u): Measurements.
-* macro arguments: Request and Macro Arguments.
-* macro basics: Basics.
-* macro directories: Macro Directories.
-* macro files, searching: Macro Directories.
-* macro name register (\$0): Parameters.
-* macro names, starting with [ or ], and refer: Identifiers.
-* macro packages <1>: Macro Packages.
-* macro packages: Macro Package Intro.
-* macro packages, structuring the source code: Requests.
-* macro, appending (am): Writing Macros.
-* macro, arguments (\$): Parameters.
-* macro, creating alias (als): Strings.
-* macro, end-of-input (em): End-of-input Traps.
-* macro, removing (rm): Strings.
-* macro, renaming (rn): Strings.
-* macros: Macros.
-* macros for manual pages [man]: Man usage.
-* macros, recursive: while.
-* macros, searching: Macro Directories.
-* macros, shared name space with strings and diversions: Strings.
-* macros, tutorial for users: Tutorial for Macro Users.
-* macros, writing: Writing Macros.
-* major quotes: Displays.
-* major version number register (.x): Built-in Registers.
-* man macros: Man usage.
-* man macros, bold face: Man font macros.
-* man macros, custom headers and footers: Optional man extensions.
-* man macros, default indentation: Miscellaneous man macros.
-* man macros, empty space before a paragraph: Miscellaneous man macros.
-* man macros, hanging indentation: Man usage.
-* man macros, how to set fonts: Man font macros.
-* man macros, italic fonts: Man font macros.
-* man macros, line breaks with vertical space: Man usage.
-* man macros, line breaks without vertical space: Man usage.
-* man macros, moving left margin: Man usage.
-* man macros, resetting default indentation: Man usage.
-* man macros, tab stops: Miscellaneous man macros.
-* man macros, Ultrix-specific: Optional man extensions.
-* man pages: man.
-* manipulating filling and adjusting: Manipulating Filling and Adjusting.
-* manipulating hyphenation: Manipulating Hyphenation.
-* manipulating spacing: Manipulating Spacing.
-* manmacros, BSD compatibility: Miscellaneous man macros.
-* manual pages: man.
-* margin for hyphenation (hym): Manipulating Hyphenation.
-* margin glyph (mc): Miscellaneous.
-* margin, bottom: Page Layout.
-* margin, left (po): Line Layout.
-* margin, top: Page Layout.
-* mark, high-water, register (.h): Diversions.
-* marking vertical page location (mk): Page Motions.
-* maximum values of Roman numerals: Assigning Formats.
-* mdoc macros: mdoc.
-* me macro package: me.
-* measurement unit: Measurements.
-* measurements: Measurements.
-* measurements, specifying safely: Default Units.
-* minimum values of Roman numerals: Assigning Formats.
-* minor version number register (.y): Built-in Registers.
-* minutes, current time (minutes): Built-in Registers.
-* mm macro package: mm.
-* mode for constant glyph space (cs): Artificial Fonts.
-* mode, compatibility: Implementation Differences.
-* mode, copy-in: Copy-in Mode.
-* mode, copy-in, and write requests: I/O.
-* mode, fill <1>: Warnings.
-* mode, fill <2>: Manipulating Filling and Adjusting.
-* mode, fill: Implicit Line Breaks.
-* mode, fill (fi): Manipulating Filling and Adjusting.
-* mode, fill, and \c: Line Control.
-* mode, line-tabs: Tabs and Fields.
-* mode, no-fill (nf): Manipulating Filling and Adjusting.
-* mode, no-fill, and \c: Line Control.
-* mode, no-space (ns): Manipulating Spacing.
-* mode, nroff: Troff and Nroff Mode.
-* mode, safer <1>: I/O.
-* mode, safer <2>: Macro Directories.
-* mode, safer: Groff Options.
-* mode, troff: Troff and Nroff Mode.
-* mode, unsafe <1>: I/O.
-* mode, unsafe <2>: Macro Directories.
-* mode, unsafe: Groff Options.
-* month of the year register (mo): Built-in Registers.
-* motion operators: Expressions.
-* motion, horizontal (\h): Page Motions.
-* motion, vertical (\v): Page Motions.
-* motions, page: Page Motions.
-* mounting font (fp): Font Positions.
-* ms macros: ms.
-* ms macros, accent marks: ms Strings and Special Characters.
-* ms macros, body text: ms Body Text.
-* ms macros, cover page: ms Cover Page Macros.
-* ms macros, creating table of contents: ms TOC.
-* ms macros, differences from AT&T: Differences from AT&T ms.
-* ms macros, displays: ms Displays and Keeps.
-* ms macros, document control registers: ms Document Control Registers.
-* ms macros, equations: ms Insertions.
-* ms macros, figures: ms Insertions.
-* ms macros, footers: ms Headers and Footers.
-* ms macros, footnotes: ms Footnotes.
-* ms macros, general structure: General ms Structure.
-* ms macros, headers: ms Headers and Footers.
-* ms macros, headings: Headings in ms.
-* ms macros, highlighting: Highlighting in ms.
-* ms macros, keeps: ms Displays and Keeps.
-* ms macros, lists: Lists in ms.
-* ms macros, margins: ms Margins.
-* ms macros, multiple columns: ms Multiple Columns.
-* ms macros, nested lists: Lists in ms.
-* ms macros, page layout: ms Page Layout.
-* ms macros, paragraph handling: Paragraphs in ms.
-* ms macros, references: ms Insertions.
-* ms macros, special characters: ms Strings and Special Characters.
-* ms macros, strings: ms Strings and Special Characters.
-* ms macros, tables: ms Insertions.
-* multi-file documents: Debugging.
-* multi-line strings: Strings.
-* multi-page table, example markup [ms]: Example multi-page table.
-* multiple columns [ms]: ms Multiple Columns.
-* n unit: Measurements.
-* name space, common, of macros, diversions, and strings: Strings.
-* named character (\C): Using Symbols.
-* names, long: Implementation Differences.
-* ne request, and the .trunc register: Page Location Traps.
-* ne request, comparison with sv: Page Control.
-* negating register values: Setting Registers.
-* nested assignments: Interpolating Registers.
-* nested diversions: Diversions.
-* nested lists [ms]: Lists in ms.
-* new page (bp) <1>: Page Control.
-* new page (bp): Basics.
-* newline character <1>: Escapes.
-* newline character: Identifiers.
-* newline character, and translations: Character Translations.
-* newline character, in strings, escaping: Strings.
-* newline, final, stripping in diversions: Strings.
-* next file, processing (nx): I/O.
-* next free font position register (.fp): Font Positions.
-* nf request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* nl register, and .d: Diversions.
-* nl register, difference to .h: Diversions.
-* nm request, using + and -: Expressions.
-* no-break control character ('): Requests.
-* no-break control character, changing (c2): Character Translations.
-* no-fill mode (nf): Manipulating Filling and Adjusting.
-* no-fill mode, and \c: Line Control.
-* no-space mode (ns): Manipulating Spacing.
-* node, output: Gtroff Internals.
-* nr request, and warnings: Warnings.
-* nr request, using + and -: Expressions.
-* nroff mode: Troff and Nroff Mode.
-* nroff, the program: History.
-* number of arguments register (.$): Parameters.
-* number register, creating alias (aln): Setting Registers.
-* number register, removing (rr): Setting Registers.
-* number register, renaming (rnn): Setting Registers.
-* number registers, dumping (pnr): Debugging.
-* number, input line, setting (lf): Debugging.
-* number, page (pn): Page Layout.
-* numbered glyph (\N) <1>: Using Symbols.
-* numbered glyph (\N): Character Translations.
-* numbered list, example markup [ms]: Lists in ms.
-* numbers, and delimiters: Escapes.
-* numbers, line, printing (nm): Miscellaneous.
-* numerals, Roman: Assigning Formats.
-* numeric expression, valid: Expressions.
-* offset, page (po): Line Layout.
-* open request, and safer mode: Groff Options.
-* opena request, and safer mode: Groff Options.
-* opening file (open): I/O.
-* operator, scaling: Expressions.
-* operators, arithmetic: Expressions.
-* operators, as delimiters: Escapes.
-* operators, comparison: Expressions.
-* operators, extremum (>?, <?): Expressions.
-* operators, logical: Expressions.
-* operators, motion: Expressions.
-* operators, unary: Expressions.
-* options: Groff Options.
-* order of evaluation in expressions: Expressions.
-* orientation, landscape: Paper Size.
-* orphan lines, preventing with ne: Page Control.
-* os request, and no-space mode: Page Control.
-* output and input requests: I/O.
-* output device name string register (.T) <1>: Built-in Registers.
-* output device name string register (.T): Groff Options.
-* output device usage number register (.T): Groff Options.
-* output devices <1>: Output Devices.
-* output devices: Output device intro.
-* output encoding, ASCII: Groff Options.
-* output encoding, cp1047: Groff Options.
-* output encoding, EBCDIC: Groff Options.
-* output encoding, latin-1 (ISO 8859-1): Groff Options.
-* output encoding, utf-8: Groff Options.
-* output glyphs, and input characters,compatibility with AT&T troff: Implementation Differences.
-* output line number register (ln): Built-in Registers.
-* output line, continuation (\c): Line Control.
-* output line, horizontal position, register (.k): Page Motions.
-* output node: Gtroff Internals.
-* output request, and \!: Diversions.
-* output, flush (fl): Debugging.
-* output, gtroff: gtroff Output.
-* output, intermediate: gtroff Output.
-* output, suppressing (\O): Suppressing output.
-* output, transparent (\!, \?): Diversions.
-* output, transparent (cf, trf): I/O.
-* output, transparent, incompatibilities with AT&T troff: Implementation Differences.
-* output, troff: gtroff Output.
-* overlapping characters: Using Symbols.
-* overstriking glyphs (\o): Page Motions.
-* P unit: Measurements.
-* p unit: Measurements.
-* packages, macros: Macro Packages.
-* padding character, for fields (fc): Fields.
-* page break, conditional (ne): Page Control.
-* page control: Page Control.
-* page ejecting register (.pe): Page Location Traps.
-* page footers: Page Location Traps.
-* page headers: Page Location Traps.
-* page layout: Page Layout.
-* page layout [ms]: ms Page Layout.
-* page length (pl): Page Layout.
-* page length register (.p): Page Layout.
-* page location traps: Page Location Traps.
-* page location, vertical, marking (mk): Page Motions.
-* page location, vertical, returning to marked (rt): Page Motions.
-* page motions: Page Motions.
-* page number (pn): Page Layout.
-* page number character (%): Page Layout.
-* page number character, changing (pc): Page Layout.
-* page number register (%): Page Layout.
-* page offset (po): Line Layout.
-* page orientation, landscape: Paper Size.
-* page, new (bp): Page Control.
-* paper formats: Paper Formats.
-* paper size: Paper Size.
-* paragraphs: Paragraphs.
-* parameters: Parameters.
-* parentheses: Expressions.
-* path, for font files: Font Directories.
-* path, for tmac files: Macro Directories.
-* patterns for hyphenation (hpf): Manipulating Hyphenation.
-* pi request, and groff: I/O.
-* pi request, and safer mode: Groff Options.
-* pic, the program: gpic.
-* pica unit (P): Measurements.
-* pile, glyph (\b): Drawing Requests.
-* pl request, using + and -: Expressions.
-* planting a trap: Traps.
-* platform-specific directory: Macro Directories.
-* pn request, using + and -: Expressions.
-* po request, using + and -: Expressions.
-* point size registers (.s, .ps): Changing Type Sizes.
-* point size registers, last-requested (.psr, .sr): Fractional Type Sizes.
-* point sizes, changing (ps, \s): Changing Type Sizes.
-* point sizes, fractional <1>: Implementation Differences.
-* point sizes, fractional: Fractional Type Sizes.
-* point unit (p): Measurements.
-* polygon, drawing (\D'p ...'): Drawing Requests.
-* polygon, solid, drawing (\D'P ...'): Drawing Requests.
-* position of lowest text line (.h): Diversions.
-* position, absolute, operator (|): Expressions.
-* position, horizontal input line, saving (\k): Page Motions.
-* position, horizontal, in input line, register (hp): Page Motions.
-* position, horizontal, in output line, register (.k): Page Motions.
-* position, vertical, in diversion, register (.d): Diversions.
-* positions, font: Font Positions.
-* post-vertical line spacing: Changing Type Sizes.
-* post-vertical line spacing register (.pvs): Changing Type Sizes.
-* post-vertical line spacing, changing (pvs): Changing Type Sizes.
-* postprocessor access: Postprocessor Access.
-* postprocessors: Output device intro.
-* PostScript fonts: Font Families.
-* PostScript, bounding box: Miscellaneous.
-* PostScript, embedding: Embedding PostScript.
-* prefix, for commands: Environment.
-* preprocessor, calling convention: Preprocessors in man pages.
-* preprocessors <1>: Preprocessors.
-* preprocessors: Preprocessor Intro.
-* previous font (ft, \f[], \fP): Changing Fonts.
-* previous line length (.n): Environments.
-* print current page register (.P): Groff Options.
-* printing backslash (\\, \e, \E, \[rs]) <1>: Implementation Differences.
-* printing backslash (\\, \e, \E, \[rs]): Escapes.
-* printing line numbers (nm): Miscellaneous.
-* printing to stderr (tm, tm1, tmc): Debugging.
-* printing, zero-width (\z, \Z): Page Motions.
-* process ID of gtroff register ($$): Built-in Registers.
-* processing next file (nx): I/O.
-* properties of characters (cflags): Using Symbols.
-* properties of glyphs (cflags): Using Symbols.
-* ps request, and constant glyph space mode: Artificial Fonts.
-* ps request, incompatibilities with AT&T troff: Implementation Differences.
-* ps request, using + and -: Expressions.
-* ps request, with fractional type sizes: Fractional Type Sizes.
-* pso request, and safer mode: Groff Options.
-* pvs request, using + and -: Expressions.
-* quotes, major: Displays.
-* quotes, trailing: Strings.
-* radicalex glyph, and cflags: Using Symbols.
-* ragged-left: Manipulating Filling and Adjusting.
-* ragged-right: Manipulating Filling and Adjusting.
-* rc request, and glyph definitions: Using Symbols.
-* read-only register, changing format: Assigning Formats.
-* reading from standard input (rd): I/O.
-* recursive macros: while.
-* refer, and macro names starting with [ or ]: Identifiers.
-* refer, the program: grefer.
-* reference, gtroff: gtroff Reference.
-* references [ms]: ms Insertions.
-* register, creating alias (aln): Setting Registers.
-* register, format (\g): Assigning Formats.
-* register, removing (rr): Setting Registers.
-* register, renaming (rnn): Setting Registers.
-* registers: Registers.
-* registers specific to grohtml: grohtml specific registers and strings.
-* registers, built-in: Built-in Registers.
-* registers, interpolating (\n): Interpolating Registers.
-* registers, setting (nr, \R): Setting Registers.
-* removing diversion (rm): Strings.
-* removing glyph definition (rchar, rfschar): Using Symbols.
-* removing macro (rm): Strings.
-* removing number register (rr): Setting Registers.
-* removing request (rm): Strings.
-* removing string (rm): Strings.
-* renaming diversion (rn): Strings.
-* renaming macro (rn): Strings.
-* renaming number register (rnn): Setting Registers.
-* renaming request (rn): Strings.
-* renaming string (rn): Strings.
-* request arguments: Request and Macro Arguments.
-* request, removing (rm): Strings.
-* request, renaming (rn): Strings.
-* request, undefined: Comments.
-* requests: Requests.
-* requests for drawing: Drawing Requests.
-* requests for input and output: I/O.
-* resolution, device: DESC File Format.
-* resolution, horizontal: DESC File Format.
-* resolution, horizontal, register (.H): Built-in Registers.
-* resolution, vertical: DESC File Format.
-* resolution, vertical, register (.V): Built-in Registers.
-* returning to marked vertical page location (rt): Page Motions.
-* revision number register (.Y): Built-in Registers.
-* rf, the program: History.
-* right-justifying (rj): Manipulating Filling and Adjusting.
-* rj request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* rn glyph, and cflags: Using Symbols.
-* roff, the program: History.
-* roman glyph, correction after italic glyph (\/): Ligatures and Kerning.
-* roman glyph, correction before italic glyph (\,): Ligatures and Kerning.
-* Roman numerals: Assigning Formats.
-* Roman numerals, maximum and minimum: Assigning Formats.
-* rq glyph, and rq string [man]: Predefined man strings.
-* rq glyph, at end of sentence <1>: Using Symbols.
-* rq glyph, at end of sentence: Sentences.
-* rt request, using + and -: Expressions.
-* ru glyph, and cflags: Using Symbols.
-* runoff, the program: History.
-* s unit <1>: Fractional Type Sizes.
-* s unit: Measurements.
-* safer mode <1>: I/O.
-* safer mode <2>: Macro Directories.
-* safer mode: Groff Options.
-* saving horizontal input line position (\k): Page Motions.
-* scaling operator: Expressions.
-* searching fonts: Font Directories.
-* searching macro files: Macro Directories.
-* searching macros: Macro Directories.
-* seconds, current time (seconds): Built-in Registers.
-* sentence space: Sentences.
-* sentence space size register (.sss): Manipulating Filling and Adjusting.
-* sentences: Sentences.
-* setting diversion trap (dt): Diversion Traps.
-* setting end-of-input trap (em): End-of-input Traps.
-* setting input line number (lf): Debugging.
-* setting input line trap (it): Input Line Traps.
-* setting registers (nr, \R): Setting Registers.
-* shading filled objects (\D'f ...'): Drawing Requests.
-* shc request, and translations: Character Translations.
-* site-specific directory <1>: Font Directories.
-* site-specific directory: Macro Directories.
-* size of sentence space register (.sss): Manipulating Filling and Adjusting.
-* size of type: Sizes.
-* size of word space register (.ss): Manipulating Filling and Adjusting.
-* size, paper: Paper Size.
-* sizes: Sizes.
-* sizes, fractional <1>: Implementation Differences.
-* sizes, fractional: Fractional Type Sizes.
-* skew, of last glyph (.csk): Environments.
-* slant, font, changing (\S): Artificial Fonts.
-* soelim, the program: gsoelim.
-* soft hyphen character, setting (shc): Manipulating Hyphenation.
-* soft hyphen glyph (hy): Manipulating Hyphenation.
-* solid circle, drawing (\D'C ...'): Drawing Requests.
-* solid ellipse, drawing (\D'E ...'): Drawing Requests.
-* solid polygon, drawing (\D'P ...'): Drawing Requests.
-* sp request, and no-space mode: Manipulating Spacing.
-* sp request, and traps: Manipulating Spacing.
-* sp request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* space between sentences: Sentences.
-* space between sentences register (.sss): Manipulating Filling and Adjusting.
-* space between words register (.ss): Manipulating Filling and Adjusting.
-* space character: Escapes.
-* space character, zero width (\&) <1>: Drawing Requests.
-* space character, zero width (\&) <2>: Ligatures and Kerning.
-* space character, zero width (\&): Requests.
-* space characters, in expressions: Expressions.
-* space, discardable, horizontal: Manipulating Filling and Adjusting.
-* space, discarded, in traps: Manipulating Spacing.
-* space, horizontal (\h): Page Motions.
-* space, horizontal, unformatting: Strings.
-* space, unbreakable: Page Motions.
-* space, vertical, unit (v): Measurements.
-* space, width of a digit (\0): Page Motions.
-* spaces with ds: Strings.
-* spaces, in a macro argument: Request and Macro Arguments.
-* spaces, leading and trailing: Filling and Adjusting.
-* spacing: Basics.
-* spacing, manipulating: Manipulating Spacing.
-* spacing, vertical: Sizes.
-* special characters <1>: Special Characters.
-* special characters: Character Translations.
-* special characters [ms]: ms Strings and Special Characters.
-* special fonts <1>: Font File Format.
-* special fonts <2>: Special Fonts.
-* special fonts: Using Symbols.
-* special fonts, emboldening: Artificial Fonts.
-* special request, and font translations: Changing Fonts.
-* special request, and glyph search order: Using Symbols.
-* spline, drawing (\D'~ ...'): Drawing Requests.
-* springing a trap: Traps.
-* sqrtex glyph, and cflags: Using Symbols.
-* stacking glyphs (\b): Drawing Requests.
-* standard input, reading from (rd): I/O.
-* stderr, printing to (tm, tm1, tmc): Debugging.
-* stops, tabulator: Tab Stops.
-* string arguments: Strings.
-* string expansion (\*): Strings.
-* string interpolation (\*): Strings.
-* string, appending (as): Strings.
-* string, creating alias (als): Strings.
-* string, length of (length): Strings.
-* string, removing (rm): Strings.
-* string, renaming (rn): Strings.
-* strings: Strings.
-* strings [ms]: ms Strings and Special Characters.
-* strings specific to grohtml: grohtml specific registers and strings.
-* strings, multi-line: Strings.
-* strings, shared name space with macros and diversions: Strings.
-* stripping final newline in diversions: Strings.
-* structuring source code of documents or macro packages: Requests.
-* sty request, and changing fonts: Changing Fonts.
-* sty request, and font positions: Font Positions.
-* sty request, and font translations: Changing Fonts.
-* styles, font: Font Families.
-* substring (substring): Strings.
-* suppressing output (\O): Suppressing output.
-* sv request, and no-space mode: Page Control.
-* switching environments (ev): Environments.
-* sy request, and safer mode: Groff Options.
-* symbol: Using Symbols.
-* symbol table, dumping (pm): Debugging.
-* symbol, defining (char): Using Symbols.
-* symbols, using: Using Symbols.
-* system() return value register (systat): I/O.
-* tab character <1>: Escapes.
-* tab character: Tab Stops.
-* tab character, and translations: Character Translations.
-* tab character, non-interpreted (\t): Tabs and Fields.
-* tab repetition character (tc): Tabs and Fields.
-* tab settings register (.tabs): Tabs and Fields.
-* tab stops: Tab Stops.
-* tab stops [man]: Miscellaneous man macros.
-* tab stops, for TTY output devices: Tabs and Fields.
-* tab, line-tabs mode: Tabs and Fields.
-* table of contents <1>: Leaders.
-* table of contents: Table of Contents.
-* table of contents, creating [ms]: ms TOC.
-* tables [ms]: ms Insertions.
-* tabs, and fields: Tabs and Fields.
-* tabs, before comments: Comments.
-* tbl, the program: gtbl.
-* text line, position of lowest (.h): Diversions.
-* text, gtroff processing: Text.
-* text, justifying: Manipulating Filling and Adjusting.
-* text, justifying (rj): Manipulating Filling and Adjusting.
-* thickness of lines (\D't ...'): Drawing Requests.
-* three-part title (tl): Page Layout.
-* ti request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* ti request, using + and -: Expressions.
-* time, current: I/O.
-* time, current, hours (hours): Built-in Registers.
-* time, current, minutes (minutes): Built-in Registers.
-* time, current, seconds (seconds): Built-in Registers.
-* title line (tl): Page Layout.
-* title line length register (.lt): Page Layout.
-* title line, length (lt): Page Layout.
-* title page, example markup: ms Cover Page Macros.
-* titles: Page Layout.
-* tkf request, and font styles: Font Families.
-* tkf request, and font translations: Changing Fonts.
-* tkf request, with fractional type sizes: Fractional Type Sizes.
-* tl request, and mc: Miscellaneous.
-* tmac, directory: Macro Directories.
-* tmac, path: Macro Directories.
-* TMPDIR, environment variable: Environment.
-* token, input: Gtroff Internals.
-* top margin: Page Layout.
-* top-level diversion: Diversions.
-* top-level diversion, and \!: Diversions.
-* top-level diversion, and \?: Diversions.
-* top-level diversion, and bp: Page Control.
-* tr request, and glyph definitions: Using Symbols.
-* tr request, and soft hyphen character: Manipulating Hyphenation.
-* tr request, incompatibilities with AT&T troff: Implementation Differences.
-* track kerning: Ligatures and Kerning.
-* track kerning, activating (tkf): Ligatures and Kerning.
-* trailing quotes: Strings.
-* trailing spaces: Filling and Adjusting.
-* translations of characters: Character Translations.
-* transparent characters <1>: Using Symbols.
-* transparent characters: Sentences.
-* transparent output (\!, \?): Diversions.
-* transparent output (cf, trf): I/O.
-* transparent output, incompatibilities with AT&T troff: Implementation Differences.
-* trap, changing location (ch): Page Location Traps.
-* trap, distance, register (.t): Page Location Traps.
-* trap, diversion, setting (dt): Diversion Traps.
-* trap, end-of-input, setting (em): End-of-input Traps.
-* trap, input line, setting (it): Input Line Traps.
-* trap, planting: Traps.
-* trap, springing: Traps.
-* traps: Traps.
-* traps, and discarded space: Manipulating Spacing.
-* traps, and diversions: Page Location Traps.
-* traps, blank line: Blank Line Traps.
-* traps, diversion: Diversion Traps.
-* traps, dumping (ptr): Debugging.
-* traps, end-of-input: End-of-input Traps.
-* traps, input line: Input Line Traps.
-* traps, input line, and interrupted lines (itc): Input Line Traps.
-* traps, page location: Page Location Traps.
-* traps, sprung by bp request (.pe): Page Location Traps.
-* trf request, and invalid characters: I/O.
-* trf request, causing implicit linebreak: Manipulating Filling and Adjusting.
-* trin request, and asciify: Diversions.
-* troff mode: Troff and Nroff Mode.
-* troff output: gtroff Output.
-* truncated vertical space register (.trunc): Page Location Traps.
-* tutorial for macro users: Tutorial for Macro Users.
-* type size: Sizes.
-* type size registers (.s, .ps): Changing Type Sizes.
-* type sizes, changing (ps, \s): Changing Type Sizes.
-* type sizes, fractional <1>: Implementation Differences.
-* type sizes, fractional: Fractional Type Sizes.
-* u unit: Measurements.
-* uf request, and font styles: Font Families.
-* ul glyph, and cflags: Using Symbols.
-* ul request, and font translations: Changing Fonts.
-* Ultrix-specific man macros: Optional man extensions.
-* unary operators: Expressions.
-* unbreakable space: Page Motions.
-* undefined identifiers: Identifiers.
-* undefined request: Comments.
-* underline font (uf): Artificial Fonts.
-* underlining (ul): Artificial Fonts.
-* underlining, continuous (cu): Artificial Fonts.
-* underscore glyph (\[ru]): Drawing Requests.
-* unformatting diversions (asciify): Diversions.
-* unformatting horizontal space: Strings.
-* Unicode <1>: Using Symbols.
-* Unicode: Identifiers.
-* unit, c: Measurements.
-* unit, f: Measurements.
-* unit, f, and colors: Colors.
-* unit, i: Measurements.
-* unit, M: Measurements.
-* unit, m: Measurements.
-* unit, n: Measurements.
-* unit, P: Measurements.
-* unit, p: Measurements.
-* unit, s <1>: Fractional Type Sizes.
-* unit, s: Measurements.
-* unit, u: Measurements.
-* unit, v: Measurements.
-* unit, z <1>: Fractional Type Sizes.
-* unit, z: Measurements.
-* units of measurement: Measurements.
-* units, default: Default Units.
-* unnamed fill colors (\D'F...'): Drawing Requests.
-* unnamed glyphs: Using Symbols.
-* unnamed glyphs, accessing with \N: Font File Format.
-* unsafe mode <1>: I/O.
-* unsafe mode <2>: Macro Directories.
-* unsafe mode: Groff Options.
-* user's macro tutorial: Tutorial for Macro Users.
-* user's tutorial for macros: Tutorial for Macro Users.
-* using symbols: Using Symbols.
-* utf-8, output encoding: Groff Options.
-* v unit: Measurements.
-* valid numeric expression: Expressions.
-* value, incrementing without changing the register: Auto-increment.
-* variables in environment: Environment.
-* version number, major, register (.x): Built-in Registers.
-* version number, minor, register (.y): Built-in Registers.
-* vertical line drawing (\L): Drawing Requests.
-* vertical line spacing register (.v): Changing Type Sizes.
-* vertical line spacing, changing (vs): Changing Type Sizes.
-* vertical line spacing, effective value: Changing Type Sizes.
-* vertical motion (\v): Page Motions.
-* vertical page location, marking (mk): Page Motions.
-* vertical page location, returning to marked (rt): Page Motions.
-* vertical position in diversion register (.d): Diversions.
-* vertical position trap enable register (.vpt): Page Location Traps.
-* vertical position traps, enabling (vpt): Page Location Traps.
-* vertical resolution: DESC File Format.
-* vertical resolution register (.V): Built-in Registers.
-* vertical space unit (v): Measurements.
-* vertical spacing: Sizes.
-* warnings <1>: Warnings.
-* warnings: Debugging.
-* warnings, level (warn): Debugging.
-* what is groff?: What Is groff?.
-* while: while.
-* while request, and the ! operator: Expressions.
-* while request, confusing with br: while.
-* while request, operators to use with: Operators in Conditionals.
-* whitespace characters: Identifiers.
-* width escape (\w): Page Motions.
-* width, of last glyph (.w): Environments.
-* word space size register (.ss): Manipulating Filling and Adjusting.
-* writing macros: Writing Macros.
-* writing to file (write): I/O.
-* year, current, register (year, yr): Built-in Registers.
-* z unit <1>: Fractional Type Sizes.
-* z unit: Measurements.
-* zero width space character (\&) <1>: Drawing Requests.
-* zero width space character (\&) <2>: Ligatures and Kerning.
-* zero width space character (\&): Requests.
-* zero-width printing (\z, \Z): Page Motions.
-* |, and page motion: Expressions.
-
-
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