It was taken out of the game in later patches because of a netcode rewrite; as mentioned in the wiki article, the original netcode implementation brought IPX ne

It was taken out of the game in later patches because of a netcode rewrite; as mentioned in the wiki article, the original netcode implementation brought IPX networks to their knees. Chocolate Doom re-implements this feature: http://www.chocolate-doom.org/wiki/index.php/Three_screen_mode http://www.chocolate-doom.org/wiki/index.php/Three_screen_mo...