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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Operating System (OS)
The dispatcher

puts tasks in I/O wait
None of these
actually schedules the tasks into the processor
never changes task priorities
is always small and simple

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