A function key is a key on a computer which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions.
The function keys are from F1
The F1 key will bring up the help menu. If you press F1 while working in a program, help for that program will be displayed. If you press F1 at the Windows desktop or when the Windows Explorer is open, a Windows help screen will appear.
The F2 key is used to rename the selected item in Windows. Select the item and press F2, you will be able to rename the item.
The F3 key is used to find the files in Window.
The F4 key is used to open the address bar in Windows. This will also work in the Internet explorer.
The F5 key is the refresh key. This can also be used to refresh the web page.
The F6 key is used to move the cursor around the program. Pressing it often will cycle you through the Windows.
F7 key does not have any functionality in Windows. It may be used in some individual programs.
F8 key is used to access Safe Mode, if you press it during the computers boot up process. It is a trouble-shooting mode, which will start the computer with minimal drivers.
F9 key does not have any functionality in Windows. It may, however be used in some individual programs.
F10 key is used to activate the menu keys in Windows and also in many of the programs. It is used to highlight the first menu choice and we can use the arrow keys to move around.
F11 is used to open the window to full screen mode in Windows and also in many other programs.
F12 key does not have any functionality in Windows. It may, however be used in some individual programs.