Doom *originally* supported multimonitor gameplay through the most overkill method possible by using a separate computer for each monitor. Even if you have the hardware, it's a lot of work to set up, but I've always wanted to give it a shot. So today I finally did!
Chcocolate Doom's Three Screen Mode: https://www.chocolate-doom.org/wiki/index.php/Three_screen_mode
More on Original Doom's multimonitor: https://doomwiki.org/wiki/Three_screen_mode
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