Operating System (OS)
A spooler is a

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
Program that coordinates the print job that are waiting to process

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Operating System (OS)
Feed back queue

are very easy to implement
dispatch tasks according to execution characteristics
None of these
require manual intervention to implement properly
are used to favor real-time tasks

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