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What is the use of Functional Keys in Keyboard and its Operation

What is the use of Functional Keys in Keyboard
What is Functional Keys ?

Normally in all keyboards you can see the functional keys which start from F1 to F12 in the above image also shown the functional keys with green underline.

What is the Use of these functional keys?

Each key used for individual operation

F1 - Help
F2 - Rename
F3 - Search
F4 - Address bar
F5 - Refresh
F6 - Spelling
F7 - No operation
F8 - Safe Mode
F9 - No operation
F10 - Menu Bar
F11 - Resize
F12 - Save

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