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The touch uses an IR touchscreen.
The touchscreen reports how much light is blocked from each of multiple LED/photocell pairs, and can interpolate small positions between them depending on how much light is blocked by two or more adjacent cell pairs.
I found that it works okay with the fat end of round chinese chopsticks if held perpendicular to the screen.
Using a stylus smaller than a chopstick may not case a shadow on a photocell at some positions on the screen, and in that case would be invisible to the touchscreen sensors.
The eraser end of a pencil also works.
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