Here's a future technology demonstration at Nokia World 2010. Plug and Touch is an application which runs on a Symbian device with TV-Out capability. Using the camera to monitor the phone out put on the screen, it monitors the position and movement of your finger in front of the large (e.g. TV) display, and simulates finger taps on its own screen, thus turning any TV (or projector screen) into a large touch screen.
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