i'm doing a nasty, horrible, strange patchwork for a smart aim! (at least, i think so!)
The final aim, is to launch multiplayer games via messenger. yes, messenger.
You'll invite somebody like following:
"Mofu wants to play pong with you! click here to play!"
By clicking, it'll call a link => http://.../game.php?ip=0.0.0.0
which will create a custom jnlp file including the host IP as argument for the program which will try to connect to it when launched!
Tadam! You click accept and you play!
Well, that's the theory!