Samsung NP-R50 User Manual page 24

<F12/Scroll> Scroll Lock
< / > Volume Down
< / > Volume Up
< / > Brightness Up
< / > Brightness Down
When you press a function key combination, the system sound may be
temporarily muted.
Scrolls the screen up and down while the cursor position does not
change in some applications.
Decreases the audio volume.
Increases the audio volume.
Makes the LCD screen brighter.
Makes the LCD screen dimmer.
Getting Started 11