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+.SH
+Functions of RCS (Revision Control System)
+.PP
+RCS manages software libraries. It greatly increases programmer productivity
+by providing the following functions.
+.IP 1.
+RCS stores and retrieves multiple revisions of program and other text.
+Thus, one can maintain one or more releases while developing the next
+release, with a minimum of space overhead. Changes no longer destroy the
+original -- previous revisions remain accessible.
+.RS
+.IP a.
+Maintains each module as a tree of revisions.
+.IP b.
+Project libraries can
+be organized centrally, decentralized, or any way you like.
+.IP c.
+RCS works for any type of text: programs, documentation, memos, papers,
+graphics, VLSI layouts, form letters, etc.
+.RE
+.IP 2.
+RCS maintains a complete history of changes.
+Thus, one can find out what happened to a module easily
+and quickly, without having to compare source listings or
+having to track down colleagues.
+.RS
+.IP a.
+RCS performs automatic record keeping.
+.IP b.
+RCS logs all changes automatically.
+.IP c.
+RCS guarantees project continuity.
+.RE
+.IP 3.
+RCS manages multiple lines of development.
+.IP 4.
+RCS can merge multiple lines of development.
+Thus, when several parallel lines of development must be consolidated
+into one line, the merging of changes is automatic.
+.IP 5.
+RCS flags coding conflicts.
+If two or more lines of development modify the same section of code,
+RCS can alert programmers about overlapping changes.
+.IP 6.
+RCS resolves access conflicts.
+When two or more programmers wish to modify the same revision,
+RCS alerts the programmers and makes sure that one modification won't wipe
+out the other one.
+.IP 7.
+RCS provides high-level retrieval functions.
+Revisions can be retrieved according to ranges of revision numbers,
+symbolic names, dates, authors, and states.
+.IP 8.
+RCS provides release and configuration control.
+Revisions can be marked as released, stable, experimental, etc.
+Configurations of modules can be described simply and directly.
+.IP 9.
+RCS performs automatic identification of modules with name, revision
+number, creation time, author, etc.
+Thus, it is always possible to determine which revisions of which
+modules make up a given configuration.
+.IP 10.
+Provides high-level management visibility.
+Thus, it is easy to track the status of a software project.
+.RS
+.IP a.
+RCS provides a complete change history.
+.IP b.
+RCS records who did what when to which revision of which module.
+.RE
+.IP 11.
+RCS is fully compatible with existing software development tools.
+RCS is unobtrusive -- its interface to the file system is such that
+all your existing software tools can be used as before.
+.IP 12.
+RCS' basic user interface is extremely simple. The novice need to learn
+only two commands. Its more sophisticated features have been
+tuned towards advanced software development environments and the
+experienced software professional.
+.IP 13.
+RCS simplifies software distribution if customers
+maintain sources with RCS also. This technique assures proper
+identification of versions and configurations, and tracking of customer
+modifications. Customer modifications can be merged into distributed
+versions locally or by the development group.
+.IP 14.
+RCS needs little extra space for the revisions (only the differences).
+If intermediate revisions are deleted, the corresponding
+differences are compressed into the shortest possible form.
+.IP 15.
+RCS is implemented with reverse deltas. This means that
+the latest revision, which is the one that is accessed most often,
+is stored intact. All others are regenerated from the latest one
+by applying reverse deltas (backward differences). This
+results in fast access time for the revision needed most often.