Please give more informations about your server setup. What OS and what webserver are you using? ("Service" sounds like you are using Windows).

The Apace Webserver has a tool called 'suexec' which allows you to run Perl and other CGI scripts under different accounts. No idea if this tool is still used in Apache 2.x or how other Webservers are doing it.

I can not understand your last sentence. Which parameters should be passed how to the service? When it starts or when it is called? At start-up or when it is called?