Dell Inspiron 7501 Setup And Specifications page 21

Function key
The Fn key is also used with selected keys on the keyboard to invoke other secondary functions.
Table 24. List of keyboard shortcuts
Function key
Redefined key (for multimedia control)
Behavior
Pause/Break
Toggle scroll lock
System request
Open application menu
Toggle Fn-key lock
Behavior
Increase brightness
Switch to external display
Print screen
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Keyboard shortcuts 21