KEY BOARD - FUNCTION KEYS:

Every one of us has seen these 12 function keys on the Keyboard.

These function keys perform different functions in different applications and programs. 

In combination with other keys these function keys perform different functions differently. 

F1

If you are in an application and you press this key, you will get its help file. Suppose you are not in Windows Explorer or Desktop, you press this key you will get Windows Help file. Suppose you are in an application, and you want windows help file, press windows key + F1, you will get windows help file. F1 + in combination with other keys:

SHIFT + F1 = Start context-sensitive help or reveal formatting (What is this? help)
ALT + F1 = Go to the next field
ALT + SHIFT + F1 = Go to the previous field
CTRL + ALT + F1 = Display Microsoft system information
For formatting characters and paragraphs:
CTRL + SHIFT + F1 = Change the font 

F2

You select a program on your Desktop (icon) and press this key. You will be allowed to rename that program. The same function you can also perform by Right Clicking the mouse and in the resultant memo you will have the option to rename the program.

SHIFT + F2 = Copy Text
CTRL + F2 = Choose the print preview command (file menu)
ALT + SHIFT + F2 = Choose the save command (file menu)
CTRL + ALT + F2 = Choose the open command (file menu)

F3

While you are working in Windows Explorer or on Desktop, you press this key you will get the ‘Find Files’ window. You need not go to Start > find.
While you are working in MS Word (make your selection) and press
ALT + F3 = Create an auto text entry box appears.
SHIFT + F3 = Change the case of the letters.

F4

While you are in Internet Explorer and you will press this key the address bar will open.
If you want to close the selected window, press ALT + F4.
When no windows are open if you press ALT + F4, you will see the shut down screen. When no windows are open if you press ALT + F4, you will see the shut down screen.
When you are in MS Word, press
F4 = Repeat the last action
SHIFT + F4 = Repeat a Find or Go To action
CTRL + F4 = Close the Window
ALT + F4 = Quit the word program

F5

To refresh the active window in IE or WE, press F5.
When you are in MS Word and you press this key, you will have the Find and replace window > Go To (Edit menu)
SHIFT + F5 = Move to previous revision
CTRL + F5 = Restore the document window size
CTRL + SHIFT + F5 = Edit a bookmark
ALT + F5 = Quit the word program 

F6

To move the cursor in the structure of IE or WE you can use this key.
When you are in MS Word, press this key, you will go to the next pane or frame.
SHIFT + F6 = Go to the previous pane or frame.
CTRL + F6 = Go to the next window.
CTRL + SHIFT + F6 = Go to the previous window

F7

Users have no use of this key in Windows. But in MS Word if you press this key, you will get spelling command (Tools menu),
SHIFT + F7 = Choose the Thesaurus command (Tools > Language menu),
CTRL + F7 = Choose the move command (Control menu),
CTRL + SHIFT + F7 = Update linked information in a word source document.
ALT + F7 = Find the next misspelling or grammatical error. The ‘Check Spelling as you 
Type check box must be selected. ( Tools menu, options dialog box, spelling and grammar tab)

F8

When you press this key while booting the system, you will get the start up menu. You may enter Safe Mode. While installing windows, you press this key to accept Linux. Suppose some additional information is being available at the push pin, you can press this key to see the information or you can hide the same.
When you are in MS Word, to extend the selection, press this key.
SHIFT + F8 = Shrink the selection
CTRL + F8 = Choose the size command (document control menu)
CTRL + SHIFT + F8 = Extend a selection or block (then press an arrow key)
ALT + F8 = Run a macro 



F9

Users have no use of this key in Windows, but if you press this key in MS Word you will update the selected fields.
SHIFT + F9 = Switch between a field code and its result.
CTRL + F9 = Insert an empty field.
CTRL + SHIFT + F9 = Unlink a field
ALT + F9 = Switch between all field codes and their results
ALT + SHIFT + F9 = Run GoButton or Macrobutton from the field that displays the field results.

F10

Users have no use of this key in Windows, but if you press this key in MS Word you can activate the menu bar.
SHIFT + F10 = Display a short cut menu.
CTRL + F10 = Maximize the document window.
CTRL + SHIFT + F10 = Activate the ruler.
ALT + F10 = Maximize the program window

F11

If you press this key, you will enter the ‘Full Screen’ mode in IE. This mode is otherwise called ‘KIOSK’ mode.
In MS Word, if you press this key you will go to the next field.
SHIFT + F11 = Go to the previous field.
CTRL + F11 = Lock a field
CTRL + SHIFT + F11 = Unlock a field
ALT + F11 = Display Microsoft Visual Basic Code.
ALT + SHIFT + F11 = Display Microsoft Visual Studio Code.

F12

Users have no use of this key in Windows. But if you press this key in MS Word you can choose the Save as command (File menu).
SHIFT + F12 = Choose the Save command (File menu).
CTRL + F12 = Choose the Open command (File menu).
CTRL + SHIFT +F12 = Choose the print command (File menu) 

Courtesy : http://computinnovative.blogspot.in