• F1 through F12 are the function keys, or F keys, that run across the top of the keyboard. These keys serve as shortcuts for tasks such as saving files, printing data, and refreshing a webpage.
• The F1 key, for example, is frequently used as the default help key in many apps. In an Internet browser, the F5 key is used to refresh or reload a web page. Each operating system and software programme may have different functions for these keys.
• F1 through F12 are the function keys on today's standard PC keyboards. F1 through F24 are the function keys on some specialised PC keyboards.

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