Dell Inspiron 7490 - Fn Key Enhanced Functions

Function key Redefined key (for multimedia control) Behavior
Switch to external display
Print Screen
Home
End
The Fn key is also used with selected keys on the keyboard to invoke other secondary functions.
Table 25. List of keyboard shortcuts
Function key Behavior
Pause/Break
Toggle scroll lock
System request
Toggle between power and battery-status light/hard-drive activity
light
Open application menu
Toggle Fn-key lock
22 Keyboard shortcuts