If you have 2.6.2, and enable Syphon output in Modul8, you ought to be able to open the example client composition when you have installed the Syphon plugin for Quartz Composer, it ought to just work.
If you use the example composition, it uses Syphon Server Directory to find available servers and output a structure, which is then filtered to find the keys for the first server, and is sent to the Syphon Client.
I actually don’t have 2.6.2 at all, so I cannot test this myself, personally. I will try and get my hands on the beta, and verify the procedure. I know it works though, as people have already done it.