When Wolfenstein 3D (or was it Doom?) came out, I spent a month writing a socket library for DECnet, so we could play the game in network mode at a defence lab in which I was working. We had some great times, as in 1992 (1993?) it was uncommon to have a high speed connection between that many computers. Never did get around to releasing that winsock driver (no sourceforge then), which is a pity, as it may well have predated DEC's own socket implementation.

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edit: winsock -> socket, as it was actually written for DOS, before winsock.

Futher edit: Thinking about it, the game might have been Doom and the year 1993, as I don't think Wolfenstein 3D had a multiplayer mode