Comment by ryandrake

Glad you mentioned DOOM! Sometimes people forget that DOOM supported multiplayer as early as December 1993, via a serial line and February 1994 for IPX networking. 4 player games on a LAN in 1994! On release, TCP/IP wasn't supported at all, but as the Internet took off, that was solved as well. I remember testing an early-ish version of the 3rd party iDOOM TCP setup driver from my dorm room (10 base T connection) when I was supposed to be in class, and it was a true game changer.