fitz said:You can only use Policies if you are using Internet Explorer. Someone using Firefox/Opera/Netscape will not be affected by the policy change and their traffic will not route through your proxy server.
There are some ADM files that I found that allow you to set settings in firefox through policies... namely:
http://www.frontmotion.com/Firefox/fmfirefox.htm
and
http://spaces.msn.com/in-cider/
But I have never used them so I can't comment how well they work.