ViewSonic VPAD10 VS13790 User Manual page 35

Pen and Touch Settings
Enable Touch
1. Select the checkbox "Use your finger as an input device" to enable the touch interface.
2. Select the checkbox "Enable multi-touch gestures and inking" to enable multi-touch gestures such as 2 finger zooming.
Settings
Click the "Settings" button to adjust double tap speed and spatial tolerance, and to test your settings.
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ViewSonic VPAD10