Samsung NM40 User Manual page 24

<F11/Num Lock> Number Lock
<F12/Scroll> Scroll Lock
< / > Brightness Up
< / > Brightness Down
< / > Volume Down
< / > Volume Up
Enables the numeric keypad. (p9)
Scrolls the screen up and down while the cursor position does not
change in some applications.
Makes the LCD screen brighter.
Makes the LCD screen dimmer.
Decreases the audio volume.
Increases the audio volume.
Getting Started 11