Operating System (OS)
GUI means

Graphical user interface
Geographic user interface
Graphic user interface
Geometric user interface

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Operating System (OS)
Addressing structure

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
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these

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