Activestate dixit: PerlScript is an ActiveX scripting engine that allows you to use Perl with any ActiveX scripting host. At this time, ActiveX scripting hosts include:

• Internet Information Server 3.0/4.0/5.0
• Peer Web Services 3.0/4.0
• Microsoft Internet Explorer 5.0x
• Windows Scripting Host

In other words, PerlScript can act a a scripting engine on either side (client or server):

Client-side

Perlscript may be use like VBScript or JavaScript in html pages and runs in the context of the browser.

Server-side

The scripting engine is driven by the web server (IIS) in order to generate html to be send to client browser (like PHP).

Pages sources may become difficult to read if they both are server-side generated and contain client-side script...