yes over internet or on a LAN, nevermind.
if some author uses tcp/ip protocol, we don't mind if it's LAN or over Internet, it's the same.
But i haven't seen any emulator doing this.
It would be great to have a 2-player mode emulated on the same computer, using 2 (virtuals) screens perhaps even by launching the emulator twice but nothing seems to be done this far.
Hope we'll have some good news soon