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There are two technologies at work in a clipboard PC: one allows raw data to get into the computer and the other allows the computer to figure out what that data means. The first technology relies principally on hardware and varies depending on the particular computer. In one system, marketed under the name GRID Pad, the computer’s LCD screen is covered by a sheet of glass with a transparent conductive coating. Voltages are sent across the glass in horizontal and vertical lines forming a fine grid; at any point on the grid, the voltage is slightly different. When the stylus — which is essentially a voltmeter — touches the screen, it informs the computer of the voltage at that point.. The position of the stylus is monitored several hundred times a second, so as the stylus moves across the glass, whole strings of pixels are activated