What are toggle function keys?
Keys such as "cap lock" that you do not need to hold down to change what a different key does
The function keys are the top row of keys on the keyboard, normally labelled F1-F12. By themselves they have no function - they are 'blank' spare keys meant for programs that want a place to put various keyboard shortcuts. That is, the function of the function keys is not determined by the keys but by the program using them, and could be anything or nothing.
The function keys f1 to f12, combined with the Ctrl and or Alt keys, add extra functions to the keyboard without the need for even more keys. For instance, on my Ubuntu computer, pressing down the Ctrl and Alt keys and tapping the letter T key will open a terminal window on the screen. Pressing the f11 key will toggle between a full view without taskbars showing (taking up screen space) or the normal view…
There is no direct function on a Windows PC to reboot using function keys. But shortcuts can be assigned to function keys by some programming to add functions like reboot. There are some shareware utilities which can help you reboot with single button click (one of the function keys) e.g. Winshutdown. http://code.google.com/p/winshutdown/ http://www.topshareware.com/Winshutdown-download-13448.htm - Neeraj Sharma
From the introduction of Windows 8, the function keys were 'relegated' to a secondary function. In older versions of Windows - the Function keys were a 'primary' operation, and worked with a single keypress. Windows 8 changed that to require the user to pres the Fn key simultaneously with the Function key required.