Samsung NP-RV520-W01US - Manual (Page 47)

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Chapter 3.
Using the computer
Keyboard
Screen Brightness Control
+ Or +
Volume Control
+ Or +
Alternatively, press the + key combination to
turn the volume on or off.
Numeric Key (For 15/17 inch models)
If you press the Num Lock key, you can use the numeric keys.
Other Function Keys
Performs the right-click mouse function (touchpad).