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The function key (often labelled Fn on the key) is usually used to
switch on a simulated numeric keyboard, which is provided as a separate
keypad on desktop keyboards. For those who don't want to use the
simulation there are additional external numeric keypads
available for PS/2 ports and I suppose USB ports.
Also the function key may be used in combination with some F-keys to
change display brightness, adjuste the speaker volume or mute them,
lock the keyboard, switch between external and internal display, use
different suspend modes and more. Sometimes these key combinations
work out of the box with Linux. Some require dedicated tools, for
these tools see the Hotkey chapter above.
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