Doom 1 had it, so it better be a feature in the new id Tech.
Code:
-left ++ Sets up a network terminal for the "left view"
-right ++ Sets up a network terminal for "right view"
++: If you have a network, try setting up a network game with three players.
The three terminals should have the parameters:
"doom -devparm -nodes 3 -left"
"doom -devparm -nodes 3"
"doom -devparm -nodes 3 -right"
Then, set up the left and right terminal monitors next to the middle
monitor, in a virtual-reality type configuration. When you turn your
head, you see the screen turned 90 degrees! This ONLY works with
versions 1.0, 1.1, 1.4, 1.5, and 1.6 of DOOM.