A touch screen is an input and output device
Menu options/help is displayed on the screen
A stylus may be provided
The screen may be covered by a membrane which is sensitive to pressure/heat Or there may be a line of infrared/light/lasers/sensors at the corners/sides of the screen
The pressure of the user’s finger is detected/the finger cuts the beams
The x position/coordinate calculated and y position/coordinate calculated
queen babito answered the question on July 3, 2018 at 02:38
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