Please read what I said in "No excuses about not using CGI.pm".

If you can't install a module, at least grab the source to Parallel::ForkManager, cut and paste it into your program, and vet the code. Claim it was your own, and you'll get done 20 hours earlier than you would have if you have to reinvent this already proven wheel.

I really, really, really do not understand this "module-phobia". It's OPEN SOURCE people. Use, reuse, contribute, patch. It's the way.

-- Randal L. Schwartz, Perl hacker