When I worked at XL we dabbled with Genlockable graphics cards. http://www.rpaelectronics.com/Genlock/genlock.html
The idea here is to synchronise the signals leaving the DVI output between computers.
Hugh, I want to discuss this with you, hopefully in some detail. It's something I need to integrate.
Please contact me by email or skype if you may.
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TODD SCRUTCHFIELD
...if it ain't broke...
gimme 5 and then don't act surprised