ewgeniy
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I haven't heard of MCN. There's a program called X-fire; it doesn't emulate IP addresses, but it can easily find game servers on the internet – unfortunately, I've only tested it on unrealGOTY. There's also pLan – it has a slightly different system: you create a room (and you can also join it), and you see a list of all the rooms and players, and there's a chat. There's also GameSpy, but I haven't used it.
Но поскольку я нищий,
у меня лишь есть мечты.
Я разостлал свои мечты пред вашими ногами.
Ступайте бережно, ибо вы ступаете по моим мечтам.