There's the POD for CGI::Session, and CGI::Session::Tutorial (as already mentioned). I wanted to add that there is a decent discussion on session management in the Mouse book: CGI Programming with Perl (2nd Edition), published by O'Reilly & Associates. You may find it at the library if you don't want to own your own copy. I found the book useful. The second edition has more on sessions, and more on security than the first edition, so unless you're more interested in the nuts and bolts of the common gateway interface itself, stick with the 2nd edition.