I think the important thing here is actually the webserver (as bwana147 mentioned above). Perl can be used stand alone too, but for web purposes (as in opening a simple script in a browser), you do need a webserver. The Perl docs come with sections on installing it with several webservers (check this page at ActiveState)

Greetz
Beatnik
... Quidquid perl dictum sit, altum viditur.