Operating System (OS)
A spooler is a

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
Queue of print job that are waiting to print

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

suspending some of the processes when the CPU load is high
swapping a process to the disk
bring processes from the disk to the main memory
assigning ready process to the CPU
None of these

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Operating System (OS)
The Storage-to-Storage instructions

None of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
All of these
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and have the result in one of the registers

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