I've done it with prodigy/system builder a couple of times with much help form tech support. If you have a pmc2+ you just drag the crestron software from their data base to the theatre room then fill the properties with the account name and software. You also have to add some dns entries into the processor then open ports. with a 3 series processor this is all done through your web browser menu.

The crestron ddns service takes a few hours to register so you won't instantly find out if your settings were correct.