I've played with it a bit in 2004. I had an NVIDIA video card, which has the necessary drivers to enable you to use generic LCD shutter glasses with it. It is essentially transparent to the CAD system, because the video card gets all the 3D data from the application. It is up to the video card to do the work for stereo, and it can be set in the card's drivers.
Apparently newer versions of SW have some features to help with the process, but I don't know what those features are. A way to input some head tracking info would be nice.
The way I faked head tracking in my SolidWorks experiment is as follows; I installed the CAM2PAN video/mouse software, and made some adjustments to the sensitivity and direction of movement. Then I initiated the view rotate command, and click my mouse down in the center of the model. As I moved my head left and right, the model would rotate on the screen (though it was certainly a sloppy correlation between my head movement and movement of the model). The concept of viewing a virtual world on a computer monitor is called "Fish tank VR."
My method above is a bit cumbersome, but I think it shows how cheaply VR can be done. [in my method the only hardware outside of my existing computer setup was the stereo glasses - $50)
Joe Dunfee