Operating System (OS)
The primary purpose of an operating system is:

To keep systems programmers employed
To allow people to use the computer
To make the most efficient use of the computer hardware
To make computers easier to use

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Operating System (OS)
A spooler is a

Program that coordinates the print job that are waiting to process
Message sent from the printer to the operating system when a print job is completed
Queue of print job that are waiting to print
Location in memory that maintains the contents of documents until it prints

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