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When I read source from open source projects I often find a comment line with “$Id” at the header of the file, f. ex.:
// $Id: addappwindowa.c 30792 2009-03-07 22:40:04Z neil $
That id seems to come from a Subversion keyword.
It’s automatically generated by Subversion after every commit, and it is composed by filename – revision number – date and time of last change – author of last change.
For more info on Subversion and source control, you can start by taking a look at:
http://subversion.tigris.org/
http://en.wikipedia.org/wiki/Version_control