Operating System (OS)
All of the following are task performed by the operating system except

Controlling the access that application program has to the CPU
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation
Provides an interface for user to interact with computer

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Operating System (OS)
A co-processor

Works with any application
Is quite common in modern computer
Causes all processor to function equally
Is relatively easy to support in software

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