Sending variables via Flash Media Server 3

I’ve downloaded, installed and have running Flash Media Server 3, with the intention of using it as a server for a Flash game.

However, I can’t find any documentation or tutorials specifically for simply sending data from a swf instance to a FMS app, then back.

Anyone able to point me in the right direction?- or, if it’s not too much to ask, simply write up a mini walkthrough here?

Great thanks,