CVS is a version control system, which allows you to keep old versions
of files (usually source code), keep a log of who, when, and why
changes occurred, etc., like RCS or SCCS.  It handles multiple
developers, multiple directories, triggers to enable/log/control
various operations, and can work over a wide area network.

This is the latest development version. It may not be as bug-free
as the most recent release of CVS.