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$_CGI Variable
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  DESCRIPTION
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    The $_CGI variable is simply an instantiation of Perl's CGI module. It is
    declared as "our $_CGI = new CGI;". $_CGI provides an object-based interface
    to CGI functionality for Perl programmers used to using the CGI module in
    their web-based projects. It is used internally in PTM to handle some of the
    URL, GET/POST, and HTTP header data. It does not need to be used by the
    average PTM developer, but is there for those that want it. For more
    information on how to use a CGI object, see the CGI module documentation on
    CPAN.org, or your favorite Perl documentation resource.