I’d never heard about this before, but a group reverse engineered Commander Keen, and re-built it as a network playable game!
Check it out at their site.
To build the source, you’ll needÂ Borland C++ 5.0.2 and TASM 5. Â Earlier versions may work but I haven’t tested. Â The interesting thing with the networking is that they use the same code out of DOOM.