Uses of Function Keys (F1 to F12)

• This function key is used to ask for Help. Almost every program allow this function key to help the users. When you are in a program and need help, then just press F1 key the help screen will open.
• Enter CMOS Setup
• Window key + F1 would open the Microsoft Windows help and support center.
• Open the Task Panel.

F2

• F2 Function Key is used to Rename a selected icon, file, folder or drive. 
• Alt + Ctrl + F2 opens document window in Microsoft word
• Ctrl + F2 displays the Print Preview window in Microsoft Word.
• Function Key is also used to open the BIOS Settings during booting a computer..

F3

• Often opens a search feature for many programs including Microsoft Windows when at the Window Desktop
• In MS-DOS or Windows command line F3 will repeat the last command.
• 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.
• 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 will close the program window currently active in Microsoft Windows.
• Ctrl + F4 will close the open window within the current active window in Microsoft Windows.

F5

• In all modern Internet browsers pressing F5 will refresh or reload the page or document window.
• Open the find, replace, and go to window in Microsoft Word.
• Starts a slideshow in PowerPoint.

F6

• Move the cursor to the Address bar in Internet Explorer, Mozilla Firefox, and most other Internet browsers.
•  Press Ctrl+Shift+F6 to move from one document to another one when you are in Microsoft Office Word.

F7

• Commonly used to check spell 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 off or on Caret browsing in Mozilla Firefox.

F8

• Function key used to enter the Windows startup menu, commonly used to access Windows Safe Mode.

F9

• With Mac OS 10.3 or later shows all open Windows.
• Using the Fn key + F9 at the same time will open 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 HP and Sony computers.
• Enter CMOS Setup.
• With Mac OS 10.3 or later shows all open Windows for active program.

F11

• Full-screen mode in all modern Internet browsers.
• After pressing F11 Function Key, all of the latest version of Internet Browsers go to Full Screen Mood. Again press F11 to close the Full Scree Mood.
• During booting press Ctrl+F11 to access the Hidden Recovery Partition on Dell Computers.

F12

• Open the Save as window in Microsoft Word.
• Shift + F12 save the Microsoft Word document.
• Ctrl + Shift + F12 prints a document in Microsoft Word.
• Preview a page in Microsoft Expression Web