I dabbled in LCD Shutter Glasses once by interfacing the $35.00 Sega video game glasses to the parallel port on the PC. I also wrote a 512-byte TSR to handle all of the page flipping VIA a simulated VBI. The app used only a few percent of CPU time to accomplish this. One thing which I did to remove the ghosting was to blank both lenses while a new image was being rendered. This removed ALL ghosting but in essence cut the refresh rate down by three. It still was good on high refresh rate monitors and there was absolutely NO ghost. I don't know if this is a common way of doing things but I just thought I'd share this with you. The monitor I used was a piece of junk, standard VGA mode. The reason there was no ghost was the same reason why the flicker was so bad (at 60 Hz). Both lenses would be shut while a frame was drawn. By the time the correct lens was opened, the phosphorous in the monitor had a chance to discharge (apparently). Since this experiment, though, the glasses have been sat on and stepped on. It's been a few years since this experiment, but I remember that even with the amount of flicker induced by this drawing technique, the result was truely amazing. --Dave Bixer, Senior Software Engineer, Emaginet, Inc. dave@emaginet.com