To Use The Fn Hot Keys - HP Compaq Presario,Presario 1110 Reference Manual

This hot key
Fn+F1
Fn+F2
Fn+F5
Fn+F8
Fn+F12
Fn+NumLock
Fn+Page Up
Fn+Page Down
Fn+Backspace
Basic Operation
Operating Your Computer

To use the Fn 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.
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).
Enters Hibernate mode.
Toggles Scroll Lock on and off.
Increases the audio volume and cancels the mute setting.
Decreases the audio volume.
Mutes the audio output.
30 Reference Guide