in reply to
Is this code in Perl or CGI?
This seems like a trick question...
This is Perl, for sure, but, it's a CGI script that outputs something in HTML. Or, at least the error messages are HTML. You can tell it's Perl from the opening line:
Based on the variables, it looks like some kind of chat client, but, without the "utility.pl" script, it's kind of hard to tell exactly what this does, or is meant to do.
Hope that helps!