Between the ctrl and Windows key on the lower left-hand corner of your laptop keyboard resides the function (Fn) key.  It is displayed as Fn on the key itself.  Some of you may think this key does nothing. The reason for this is because the Fn key works in a specific way.  It is a modifier key that is used on most laptop models to activate secondary or special functions of other keys.  The keys that work in conjunction with the Fn key will usually have a blue symbol or blue word displayed (the Dell laptop model XPS 13 9350 symbols are white).  Some of the more useful Fn key combinations for a variety of Dell modeled laptops that we use as loaners are listed below.  Keep in mind that many other keyboard models use very similar combinations, including desktop PCs.

Latitude 3340, 7370, 7480, & E7450

Fn + F1: Mute/unmute the volume
Fn + F2: Decrease the volume
Fn + F3: Increase the volume
Fn + F9: Search Windows
Fn + F11: Decrease the screen brightness
Fn + F12: Increase the screen brightness
Fn + PrtScr: Toggle WiFi on/off
Fn + M: 0
Fn + J: 1
Fn + K: 2
Fn + L: 3
Fn + U: 4
Fn + I: 5
Fn + O: 6
Fn + 7: 7
Fn + 8: 8
Fn + 9: 9
Fn + 0: *
Fn + ?/: +
Fn + right arrow: End

Latitude E7440

Fn + F10: Rewind audio and video
Fn + F11: Play/pause audio and video
Fn + F12: Fast forward audio and video
Fn + End: Print Screen; this will also bring up SnagIt if the program is installed on the computer
Fn + M: 0
Fn + J: 1
Fn + K: 2
Fn + L: 3
Fn + U: 4
Fn + I: 5
Fn + O: 6
Fn + 7: 7
Fn + 8: 8
Fn + 9: 9
Fn + 0: *
Fn + ?/: +
Fn + up arrow: Increase screen brightness
Fn + down arrow: Decrease screen brightness

XPS 13 9350

Fn + F1: Mute/unmute the volume
Fn + F2: Decrease the volume
Fn + F3: Increase the volume
Fn + F4: Rewind audio and video
Fn + F5: Play/pause audio and video
Fn + F6: Fast forward audio and video
Fn + F9: Windows search
Fn + F11: Decrease screen brightness
Fn + F12: Increase screen brightness
Fn + PrtScr: Toggle WiFi On/Off