The 'f' keys at the top of the keyboard are known as 'function keys' - they have special functions inside a program, an application or in your operating system. They can be pressed alone or in combination with other keys, as 'ALT', "CTRL', 'SHIFT' or 'Fn' keys, to present other functions.
In Windows, F1 generally brings you the Help for the program you're on, F3 gives you the Search box, F5 refreshes the page, F11 gives you a full page in Internet Explorer and so on. Most programs can be closed when you press the 'ALT' key together with F4.
So, inside each and every program, different functions can be attributed to the F-keys, providing you with different capabilities. For instance, you could search in Google for "Word function keys" to check how they were set up for Microsoft Word.
These keys, associated with the 'Fn' key in some laptop keyboards, can be used to increase or decrease the display brightness, start the Internet Explorer or the Media Player increase or decrease the sound volume, and even open the DVD player 'door' - it will depend of the characteristics of the different models of laptops.
Hope this helps!
Regards,
Miguel L. Martins
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