Lenovo IdeaCentre A720 User Manual page 25

On the Touch menu you can:
"Enable multi-touch gestures and inking".
can adjust the "Speed" and "Spatial tolerance" parameters, to match the
user's natural way of double-clicking. You can double-click on the lower right
corner of the icon to test this.
Note: Users can access more help information from the Windows "Help
and Support" menu.
Use your finger as an input device" and
Settings", you
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User Guide