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+.\" Copyright (c) 1980, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)intro.2	8.1 (Berkeley) 6/4/93
+.\"
+.sh 1 Variables
+.pp
+Many variables which are used to describe the terminal environment
+are available to the programmer. They are:
+.(b
+.TS
+expand;
+lw(6m) lw(8n) lw(50n).
+type	name	description
+_
+WINDOW *	curscr	T{
+.fi
+current version of the screen (terminal screen).
+T}
+WINDOW *	stdscr	T{
+standard screen.  Most updates are usually done here.
+T}
+char *	Def\*_term	T{
+default terminal type if type cannot be determined
+T}
+bool	My\*_term	T{
+use the terminal specification in \fIDef\*_term\fR as terminal,
+irrelevant of real terminal type
+T}
+char *	ttytype	T{
+full name of the current terminal.
+T}
+int	LINES	T{
+number of lines on the terminal
+T}
+int	COLS	T{
+number of columns on the terminal
+T}
+int	ERR	T{
+error flag returned by routines on a fail.
+T}
+int	OK	T{
+flag returned by routines upon success.
+T}
+.TE
+.fi
+.ev
+.)b
+.lp