Compaq Personal Computer manual To Use the Function Hot Keys, This hot key Does this

Basic Operation

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, then release both keys.

This hot key	Does this
Fn+F1	Decreases the display brightness.
Fn+F2	Increases the display brightness.
Fn+F5	Toggles the external monitor on and off.
Fn+F8	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).
Fn+F12	Initiates Hibernation.
Fn+NumLock	Toggles Scroll Lock on and off.
Fn+Page Up	Increases the audio volume and cancels the
	mute setting.
Fn+Page Down	Decreases the audio volume.
Fn+Backspace	Mutes/unmutes the audio output.

2–6 Startup Guide