Playing with CVS

If not every developer, then at least the great majority of those who’ve worked on a project that needed
 to manage its source files have encountered some kind of 
 revision control system (RCS). Most open-source 
 projects, and perhaps commercial ones too, use CVS for that purpose.

On Root.cz there was a series called A Trip to the Realm of Versions. See (Dagblog, 25 April 2003) Into the Realm of Versions with Root,
 which describes how to use RCS and CVS. The series had five parts, and recently
 two more installments appeared. On to the realm of versions: A Trip to the Realm of Versions VI and A Trip to the Realm of Versions VII.