Apparently Windows 8 has a Stereoscopic 3D checkbox in the Display section of the Control Panel. ...
Hmmmm...8.1x64 here, and this is the first time I've heard of that...;) It certainly isn't there in cpl/display options. Perhaps the OS has to detect a stereoscopic (I wish people would use the accurate term instead of "3D") gpu driver before it appears, or else an IHV's stereoscopic driver is itself putting such a checkbox there. Interesting...