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In addition to being mapped to standard keyboard keys like Scroll Lock and Num Lock, the Fn key combinations may also be mapped to control system interfaces to change the LCD brightness, VGA output, or speaker volume on most laptop computers.
A function key is a key on a computer or terminal keyboard that can be programmed to cause the operating ... including controlling sound volume and screen brightness.
On these devices, a Fn modifier key is used to combine keys to save room and add non-standard functionality; a common use is merging the row with keys F1- F12 with keys that adjust settings such as display brightness, media volume and playback, and keyboard illumination. Fn Lock toggles the default output of these keys.
Fn (Function) – often present on small-layout keyboards, or keyboard where the top row of function keys have multimedia functions like controlling volume attached. The (Sun) Meta key, Windows key, (Apple) Cmd key, and the analogous "Amiga key" ( A ) on Amiga computers, are usually handled equivalently.
Ctrl+F2 (or Fn+Ctrl+F2 on some keyboards) [notes 2] Alt: F10: Pop up contextual menu for currently selected objects (aka context menu) ⇧ Shift+F10 or ≣ Menu: Varies with laptop / extended keyboard type; enable Mouse keys in Universal Access, then Fn+Ctrl+5 or Ctrl+5 (numeric keypad) or Function+Ctrl+I (laptop) ≣ Menu: ≣ Menu or ⇧ ...
Notebook computers typically include additional assignments shared with function keys: reduce and increase brightness, volume up, volume down, mute, and eject . Apple, since the release of the Pro Keyboard, provides these last four keys on desktop keyboards above the numeric keypad where status indicator lights are on many IBM PC keyboards.
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Incidentally, the IBM PCjr keyboard, which has only, I think, 60-something keys, has an Fn key, used to issue F1-F10 key codes and some others. So, its purpose is similar to the purpose on laptops with regard to the numeric keypad (but not for sound controls, display brightness, etc.) —Preceding unsigned comment added by 71.242.7.208 ( talk ...