Operating System (OS)
Addressing structure

performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
All of these
defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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Operating System (OS)
A spooler is a

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

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Operating System (OS)
Operating system

All of these
enables the programmer to draw a flowchart
provides a layered, user-friendly interface
None of these
links a program with the subroutines it references

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