Back in the day, 1994ish, you had to run PC games in DOS to run well. But IBM had OS/2, the source code for DOS and Windows and they were doing amazing things on the PC. Great multimedia things like sync'ed video/sound and in multiple windows. Sounds crazy now but it was a big deal on the machines back in 1994. They were ramping up OS/2 Warp for consumers and hired someone to create Doom/2 for OS/2. There were two Comdex conferences, one in Spring and one in Fall. At the Spring Comdex IBM and Id showed Doom/2 and it was all the buzz. There were copies leaked off ftp sites and it was pretty cool playing Doom on the desktop with other apps. They showcased this at Spring Comdex and by Fall Comdex Microsoft had created something for the Windows beta codename Chicago because they couldn't allow OS/2 to get mind share. Chicago was to become Windows 95 was still vaporware. It was the beginning of Microsoft's venture into the gaming industry.
I found a link referencing it here: http://www.os2ezine.com/v2n7/doom.htm
The OS/2 multimedia system was pretty good back in the day and top notch on PC hardware. That is until I saw BeOS. Boy, it so sucked that Microsoft got away for so long doing illegal crap like locking vendors into installing only their OS or having to pay them even if Windows and/or DOS were not installed. BeOS shut down because they could not get any hardware vendors to install it on computers. Palm then bought BeOS and totally wasted any opportunities to use BeOS in ways which leveraged its capabilities.