Add to ORKGWith the blossoming of the personal computer as a standard accompaniment to modern homes and offices has come the desire to control these tools with greater ease and efficiency. Graphical user interfaces allow us to communicate our desires to our computers quickly and intuitively. The recent development of computer touch screens provides computer users a more interactive and intuitive way to interface with computers. However the computer touch screen available on the market is not practical to the largescale display device, such as a projection screen, because of its size and cost. The LightTouch touch screen system is designed to overcome these two disadvantages of the traditional touch screen. In addition, the LightTouch touch screen syst...