Ctrl-Alt-Del was actually disabled for awhile in the Windows Insider versions but it is fully functional in the Current Canary build (27881).

The Fn key is also known as the function key, and on Windows and most Mac keyboards, you'll find it located in the bottom-left corner of your keyboard.

The Fn key is also known as the function key, and on Windows and most Mac keyboards, you'll find it located in the bottom-left corner of your keyboard.