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1 PerryLorier 1 [Acronym] for __A__pplication __P__roduction __I__nterface.
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3 A set of exported (public) interfaces (usually functions and occasionally variables) from a library or other program, providing an interface for programmers.
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5 Some examples of [API]'s would be the libc functions in section 3 of the Man pages, and the syscall interface (which is documented in section 2).