In what way does it fail to work?
Please reduce one of your scripts to a small, self-contained script that exhibits the problem.
How do you fill %Form?
I would double check that the name of the hidden field ("hiddenfield") is actually the same between the HTML page submitting to the script and the script.
Assuming a standard CGI setup, the following could work, if your scripts use CGI.pm (and if they don't, you should start rewriting them to use CGI).
#!perl -w
use strict;
use CGI;
my $q = CGI->new();
print $q->header();
if ($q->param('hiddenfield') eq '') {
print "<h1>Hidden field was not set</h1>";
} else {
print "<h1>Hidden field was sent</h1>";
};
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