Mitsubishi Electric Research Labs has developed a unique screen which allows different users to work on the same PC at the same time. The DiamondTouch tabletop features 42″ or 32″ screen which has an array of antennas embedded in the screen. The different antennas make sure whose fingers did what and making it possible to receive multiple inputs from different users. The maximum number of persons can be 4 and the supported OS is Windows 2000/XP.
The practical applications of DiamondTouch can be into gaming, product designing or even for educational purposes. No details on the pricing but check out the videos which shows a person playing Warcraft III and another using Google Earth.