What are the uses of F1 to F12 Function Keys in Keyboard?

What are the uses of F1 to F12 Function Keys in Keyboard?

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The function keys or F-keys on a computer keyboard, labelled F1 through F12, are keys that have a special function defined by the operating system, or by a currently running program. They may be combined with the Alt or Ctrl keys. 
On Laptop 
On some smaller keyboards, including those on many laptop computers, the F-keys may have
a dedicated function such as changing the brightness of the screen, the volume of the audio,
or other device-specific functions. On these keyboards, there is typically a separate FN key
that you can hold down to indicate that you want to use the key as a standard Function key.
For instance, on the MacBook Pro laptop computer, the F12 key's primary function is to
increase the audio volume. If this key is pressed while the FN key is held down, the key will
register as F12, and trigger any software functions that are configured to use this key. 
Below is a listing of some of the more common functions of the functions keys for Microsoft
Windows and Microsoft applications, as well as some for mac OS. As mentioned above,
not all programs support these function keys, and the function keys on your keyboard may
perform different tasks than those mentioned below. 
F1 to F12 Function Keys F1 
Almost used as the help key, always every program opens a help screen when 
this key is pressed. 
Enter CMOS Setup, or Open the Task Pane. 
Windows Key + F1 would open the Microsoft Windows help and support center. 

F2 
In Windows Quickly rename a selected file & folder or highlighted icon, in all 
versions of Windows. 
In Microsoft Excel edits the active cell. 
Alt+Ctrl+F2 opens the document window in Microsoft Word. 
Ctrl+F2 displays the print preview window in Microsoft Word. 
Enter CMOS Setup. 
F3 
Often opens a search feature for many programs including Microsoft Windows 
when at the Windows Desktop. 
In MS-DOS or Windows command line F3 will repeat the last command. 
In Microsoft Word Ctrl+F3 will lowercase any highlighted text. 
Shift+F3 will change the text in Microsoft Word from upper to lower case or a capital 
letter at the beginning of every word. 
Windows Key + F3 opens the Advanced find window in Microsoft Outlook. 
In Windows Explorer start the search function. 
Open Mission Control on an Apple computer running mac OS X.
F4 
Open find window in Windows 95 to XP. 
Open the address bar in Windows Explorer and Internet Explorer. 
Repeat the last action performed (Word 2000+). 
Alt+F4 closes the program window currently active in Microsoft Windows. 
Ctrl+F4 closes the open window or tab within the active window in Microsoft 
Windows. 
F5 
In all modern Internet browsers, pressing F5 will refresh or reload the page or Open
the find/replace/go to window in Microsoft Word. Start a slideshow in PowerPoint. 
Ctrl+F5 forces a complete refresh of the web page, clearing the cache and 
downloading all contents of the page again 
Refresh the list of contents in a folder. 
Open the find, replace, and go to window in Microsoft Word. 
F6 
Move the cursor to the address bar in Internet Explorer, Mozilla Firefox, and most 
other Internet browsers. 
Ctrl+Shift+F6 opens to another open Microsoft Word document. 
Reduce laptop speaker volume (on some laptops). 
F7 
Commonly used to spell check and grammar check a document in Microsoft 
programs such as Microsoft Word, Outlook, etc. 
Shift+F7 runs a Thesaurus check on the word highlighted. 
Turns on Caret browsing in Mozilla Firefox. 
Increase laptop speaker volume (on some laptops). 
F8 
Function key used to enter the Windows start up menu while booting, commonly 
used to access Windows Safe Mode. 
Used by some computers to access the Windows recovery system, but may require 
a Windows installation CD. 
Displays a thumbnail image for all workspaces in mac OS. 
F9 
Refresh document in Microsoft Word. 
Send and receive e-mail in Microsoft Outlook. 
Opens the Measurements toolbar in Quark 5.0 (DTP). 
Reduce laptop screen brightness (on some laptops). 
With mac OS 10.3 or later, displays a thumbnail for each window in a single 
workspace. 
Using the FN key and F9 at the same time opens Mission Control on an Apple 
computer running mac OS X. 
F10 
In Microsoft Windows activates the menu bar of an open application. 
Shift+F10 is the same as right-clicking on a highlighted icon, file, or Internet link. 
Access the hidden recovery partition on Compaq, HP, and Sony computers. 
Enter CMOS Setup on some computers. 
Increase laptop screen brightness (on some laptops) 
With Mac OS 10.3 or later, shows all open Windows for the active program. 
F11 
Enter and exit full screen mode in all modern Internet browsers. 
Ctrl+F11 as the computer is starting to access the hidden recovery partition on 
many Dell computers. 
Access the hidden recovery partition on e-Machines, Gateway, and Lenovo 
computers. 
With mac OS 10.4 or later, hides all open windows and shows the Desktop. 
F12 
Open the Save as window in Microsoft Word. 
Ctrl+F12 opens a document In Word. 
Shift+F12 saves the Microsoft Word document (like Ctrl + S). 
Ctrl+Shift+F12 prints a document in Microsoft Word. 
Preview a page in Microsoft Expression Web. 
Open Firebug or browser debug tool. 
With an Apple running Mac OS 10.4 or later, F12 shows or hides the Dashboard. 
Access the list of bootable devices on a computer at start up, allowing you to select a
different device to boot from (hard drive, CD or DVD drive, floppy drive, USB drive, and
network). 
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