What are these for?

Sources:
https://en.wikipedia.org/wiki/Print_screen
https://en.wikipedia.org/wiki/System_request
https://en.wikipedia.org/wiki/Scroll_lock
https://en.wikipedia.org/wiki/Break_key
https://en.wikipedia.org/wiki/Insert_key
https://en.wikipedia.org/wiki/Home_key
https://en.wikipedia.org/wiki/Page_Up_and_Page_Down_keys
https://en.wikipedia.org/wiki/Delete_key
https://en.wikipedia.org/wiki/End_key
https://en.wikipedia.org/wiki/Menu_key

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