I hope what you're really asking is I don't want my second Perl program to run in a new process and you just don't know it.

But, as cleen writes, you aren't being very clear.

This will help you if your question is what I think it is. (you can ignore the $\ assignments, that's me testing lazily :)

$\="\n";
print $$;
if ( open PROG, '/home/userxyz/prog.pl' ) {
  undef $/;
  eval <PROG>;
  warn  $@   if $@;
  close PROG or die $!;
}
print $$;
[download]

and PROG looks like this:

#!/usr/bin/perl -w
use strict;
$|++;

$\="\n";
print $$;
[download]

If your question doen't involve the second program being Perl, then my example won't work... but I can't think of how to do it without starting a new process... I haven't had my coffee either.

Enjoy!

--
Casey