What determines the functions represented by the function keys on the keyboard?

What determines the functions represented by the function keys on the keyboard

Function keys are defined by the software, different Software-defined capabilities are different.

Function keys: The Esc key and F1~F12 keys at the top of the keyboard are collectively called function keys. The Esc key is used to force abort or exit. The F1~F12 keys are defined with different functions when running different software.
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