To solve this problem, I always write the main functionality in modules, then use very simple cgi scripts to drive them.

The cgi file may look like this:

#!/usr/bin/perl -w

use MYModule;

(MyModule::doPage(),      exit) if defined CGI::param('doPage');
(MyModule::doOtherPage(), exit) if defined CGI::param('doOtherPage');
[download]

When you put all the actual code in modules, calling one "page" from another is trivial and you can always use POSTs.

Russ