So general solutions are welcome, but a friend and I are both craving the old blizzard RTS games. The problem is: fuck that company, and they probably use a rootkit anti-cheat anyway
So is there a general solution for multiplayer in old PC games without company support, and is there a particular solution for, say, starcraft2?
Parsec is probably what you need. Me and my brother played through BG1 (for ps2 I believe) with an emulator and parsec. For the most part there was no lag. We simulated us both playing on his computer the same way you would play couch co-op, just in different areas.