Question

What happens with F3 on keyboard?

Answer 1

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.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 macOS X.

Answer 2

hi 
uses of F3 IN MACBOOK AIR IS dashboard 
in pc/window--------> 
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 toStart > 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.
thankyou