To Use The Function Hot Keys - HP Compaq Notebook Series Startup Manual

Basic Operation
Operating Your Notebook

To use the function hot keys

The combination of the Fn key plus another key creates a hot key—a shortcut key
sequence—for various system controls. To use a hot key, press and hold Fn, press the
appropriate second key, and then release both keys.
This hot key
Fn+F1
Fn+F2
Fn+F5
Fn+F8
Fn+F12
Fn+NumLock
Fn+Page Up
Fn+Page Down
Fn+Backspace
20 Startup Guide
Does this
Decreases the display brightness.
Increases the display brightness.
Toggles among the built-in display, an external
display, and simultaneous display on both.
Toggles the built-in keypad on and off. Does not
affect an external keyboard. If Num Lock is on,
then the numeric functions are active; otherwise,
cursor control is active (as marked on an
external keyboard).
Initiates Hibernation.
Toggles Scroll Lock on and off.
Increases the audio volume and cancels the
mute setting.
Decreases the audio volume.
Mutes/unmutes the audio output.