Operating System (OS)
Which of the following capabilities is required for a system program to execute more than one program at a time?

virtual memory
None of these
word processing
multitasking
compiling

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Operating System (OS)
Addressing structure

All of these
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.
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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