Samsung NP915S3G-K01US - Manual (Page 60)

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Chapter 3.
Using the computer
Touchpad On/Off Function
Locking with shortcut keys
If you want to use the mouse only without using the touchpad,
you can turn the touchpad off.
To lock the touchpad function, press the + keys.
Alternatively, press the key and then press the key to
turn the touchpad function off.
You can set the touchpad and touchpad button settings in
the tabs that appear when clicking Charms menu on the
Desktop > Settings > Control Panel > Hardware and
Sound > Touchpad.
Touchpad