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Push buttons and rotary button usage
The calibration window is shown, with the information
how to stop the touchscreen calibration procedure.
Wait 10 seconds or press any of the push buttons to abort
the touch screen calibration.
Press the marker in the top left corner and continue the
process with the other thee corners to calibrate the
screen.
To increase precision use a stylus to press on the markers!
Touch screen calibration is now successfully executed and
the terminal continues automatically to start.