They may not have been polarised glasses. A possibility is that they were shuttered goggles. The LCD's in the goggles block one eye, and then the next, in synchronism with the monitor. The monitor cycle between the eyes, showing the apropriate frame when the other eye is blocked by the LCD going opaque.
Given that this technology has been around for over a decade, and the graphics card does a lot of 3D manipulations, it is not beyond possibilty for a simple soft switch in the driver to activate a synch signal for goggles and to show alternate frames. Other methods of splitting the frames are possible, but virtual reality used to be really cool, so it may already be a part of the firmware.
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