It depends on what you're trying to do :) The example code fragment isn't standard HTML, so it needs server-side support...it literally is never sent to the web browser. Further commentary assumes you want to do it in HTML.

This won't work with normal web browsers because they don't contain Perl interpreters:

If the web browser has JavaScript enabled: this will work, if the Perl script returns a JavaScript document:

And this probably will work, if the Perl script returns HTML:

<iframe src="/cgi-bin/WonderScript.pl">
  <ilayer src="/cgi-bin/WonderScript.pl">
</iframe>
[download]

Of course, the last probably will require more HTML tags to make the thing format properly. The iframe handles W3C browsers (e.g., Internet Explorer 4+ and Netscape 6), while the ilayer handles Netscape 4.