Two separate applications cannot listen on the same UDP port. You could however write an app to listen on the port, then rebroadcast it to the other ports. Then configure the other applications to ...

I'm behind a firewall and want to host and join games in Civ II multiplayer. What ports do I need to open? UDP or TCP? When Civ II asks me my IP, do I provide my machine's IP (a class C, 192.168.x.y) ...