Operating system

In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. Additionally, it provides a foundation upon which to run application software such as word processing programs and web browsers.

System Calls

System calls are operations/services that are requested by applications from the operating system. As noted on the System Call page, "System calls often use a special machine code instruction which causes the processor to change mode (e.g. to "supervisor mode" or "protected mode")."

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