how operating system act as messanger between hardware and application program?
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The OS often acts as an intermediary between user programs and hardware. For example, to print a message on the screen, a user program could manipulate the hardware directly, but it is easier to call an operating system function to do this for you. ... Calls to the operating system are usually called system calls.
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The OS often acts as an intermediary between user programs and hardware. For example, to print a message on the screen, a user program could manipulate the hardware directly, but it is easier to call an operating system function to do this for you. ... Calls to the operating system are usually called system calls.
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