Doing a perldoc CGI reveals that CGI.pm also has a nifty explanation of cookies.
Those happy little chaps down at O'Rielly also produce two books with decent explanation of cookies:
'Perl Cookbook' &... err... something regarding Perl and CGI. (No doubt I'll think of its title shortly).

Update:See floctos guess below for the second book title

In reply to Re: Cookies without using CGI.pm by lzcd
in thread Cookies without using CGI.pm by Monolith-0

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