Using 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, then release both keys. Table 1-4. Fn Hot Keys 1-10 Product Information HP Omnibook XE3 (Technology Code GF) Hot Key Effect Fn+F1 Decreases the display brightness. Fn+F2 Increases the display brightness. Fn+F5 Toggles among the built-in display, an external display, and simultaneous display on both. Fn+F7 Mutes the notebook’s speakers. Fn+F8 Toggles the built-in numeric keypad on and off. Does not affect an external keyboard.
If Num Lock is on, the numeric functions are active; otherwise, cursor control is active. Fn+Lock key* Toggles Scroll Lock on and off. Fn+Up arrow Increases sound volume. Fn+Down arrow Decreases sound volume. *The Lock key is in the top row of the keyboard: