Operating System (OS)
Feed back queue

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

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Operating System (OS)
A spooler is a

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

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