However in my current environemnt, ptkdb is not available.

Is that because you don't have control of which perl modules are on the box that is running the webserver? Because that would severely limit things.

You should be able to get Devel::ptkdb to crank up an X window onto a different machine if you repoint $ENV{DISPLAY}, but maybe you don't have X window transport between the two machines.

Consider running your CGI script interactively, passing in any form variables from the command line. CGI.pm will pick them up, or will prompt interactively for a list of key=value lines.

If you have access to the webserver logs, you might also be able to use Devel::Trace to get a list of the lines executed. Or you could use Log::Log4perl and pepper the source with logging statements.

You might also like to try acme's Devel::ebug, relatively hot off the press, and he would welcome feedback, bug reports, patches etc.

Hope this helps