Operating System (OS)
Multi programming systems ......

Execute more jobs in the same time period
Execute each job faster
Are easier to develop than single programming system
Are used only by large mainframe computer

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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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