The file $CVSROOT/CVSROOT/history is used
to log information for the
(see history). This file must be created to turn
on logging. This is done automatically if the
cvs init command is used to set up the
repository (see Creating a repository).
The file format of the history file is
documented only in comments in the CVS source
code, but generally programs should use the
history command to access it anyway, in case the
format changes with future releases of CVS.