Operating System (OS)
A spooler is a

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

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

None of these
flexibility to the users in running lists of commands by simply collecting them in named batch command files
the command set being common across different hardware configurations
users can create system programs and run them as commands
the processing is much faster than would other-wise be the case when user defined commands are used

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