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

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Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

None of these
detects/corrects errors
inquires to see if a terminal has any transaction to send
multiplexes the inputs and updates the memory accordingly
decides correct alternative by analysing several ones

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Operating System (OS)
System generation:

is always quite simple
None of these
requires extensive tools to be understandable
is always very difficult
varies in difficulty between systems

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