in reply to Very new to PERL, want to see if CGI spawn concept is possible and or feasible without major pain

I decided to give it another go. I still don't understand what you're asking, but the key question seems to be

but as I will want to use the same subroutine from an on line screen, the parameter input I want to use is the POST record

Are you asking how to extract data from a POST request? If so, it's as simple as using CGI's param method.

You might also be interested in sessions, data stores that persist between page requests.

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