Online Multiplayer
As with the original Doom, multiplayer games used to be played using the dial-up or LAN by the internal setup program (setup.exe) or with once popular programs like Kali and Kahn (using SPX) in Windows 95. Nowadays, in the modern standards, Doom II can be played in almost any version of Windows across the internet using third party source ports such as Skulltag, ZDaemon, and Odamex, and are still popular today. The Xbox Live Arcade port of Doom II supports online multiplayer via Xbox Live.
Read more about this topic: Doom II: Hell On Earth