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T1 uses IR beams that your finger or stylus stops for a so called touch. This is why zip lock bag doesn't work but thin screen protector clinging to screen will work. Look at edge of screen at frame and see little notches for IR light. Screen protector must end short of edge of screen so these small notches are not blocked. Because of the IR beams I can operate with out touching screen only breaking the IR beams.
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