[MX2004] Flash & URLs

I was wondering if anyone knows how to use a URL such as:

www.somesite.com/pagename.htm?some_variable=value

and have flash detect or use the some_variable value.

One example is MSN Messenger’s Q6 site:

http://www.playq6.com/?lang=en&page=login

changing the value of page (such as using page=rules, or page=howToPlay) causes the flash movie to play something different.

Thanks for any help.