Samsung NP-RV520-W01US - Manual (Page 52)

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Chapter 3.
Using the computer
Touchpad
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.
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.
Auto-locking when connecting USB mouse
If an external USB pointing device is connected in the Charms
menu in Desktop > Settings > Control Panel > Hardware and
Sound > Touchpad, check Disabled to disable the touchpad
feature when connecting to the USB mouse.
This auto-locking function is not provided for some models.