Operating System (OS)
A spooler is a

Queue of print job that are waiting to print
Location in memory that maintains the contents of documents until it prints
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

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Operating System (OS)
A co-processor

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

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