Operating System (OS)
...... controls the way in which the computer system functions and provides a means by which users can interact with the computer

Application software
The operating system
The platform
The motherboard

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Operating System (OS)
Addressing structure

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

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