Samsung NP940X3G-S02US - Manual (Page 40)

Basics
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On the desktop, open the Charms and then select the
Settings charm
→ Control Panel → Hardware and Sound →
Tablet PC Settings → Calibrate....
Calibrating the screen
Calibrate the touch settings to make the screen sense accurately
when using a finger.
This feature may differ or may not be available depending
on the operating system.