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| n | Is a program that controls the execution of |
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| application
programs |
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| u | OS must
relinquish control to user programs |
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| and regain it
safely and efficiently |
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| u | Tells the CPU when to execute other pgms |
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| n | Is an
interface between the user and |
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| hardware |
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| n | Masks the
details of the hardware to |
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| application
programs |
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| u | Hence OS must
deal with hardware details |
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