> It took tremendous effort to get 3D accelerated Doom to work inside of X windows in the mid 2000s, something that was trivial with mid-1990s Microsoft Windows

> It took tremendous effort to get 3D accelerated Doom to work inside of X windows in the mid 2000s, something that was trivial with mid-1990s Microsoft Windows. Huh? I am not aware of a 3D accelerated Doom version on Windows in that timeframe nor that it was hard on Linux 10 years later. Any pointers?