Read the wikipedia link. Then you will know as much as I do.
I suspect they do have two projectors and a different filter in front of each one. It might be just one projector but a very precisely fitted filter.
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At some point we shall be able to see real 3D movies in our living rooms =D
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You already can, if you have enough cash:
http://www.engadget.com/search/?q=3d+lcd