Operating System (OS)
A spooler is a

Queue of print job that are waiting to print
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
Program that coordinates the print job that are waiting to process

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Operating System (OS)
You should choose sleep option when

The computer is tired after working for the whole day
When computer gets hanged frequently. Let it sleep for some time
You are leaving for a very short time and want to resume you work shortly
You finish working and going to bed

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