Operating System (OS)
The advantage of a command processor running only built-in commands is:

the command set being common across different hardware configurations
flexibility to the users in running lists of commands by simply collecting them in named batch command files
users can create system programs and run them as commands
None of these
the processing is much faster than would other-wise be the case when user defined commands are used

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Operating System (OS)
Virtual Memory

consists of those addresses that may be generated by a processor during execution of a computation.
None of these
allows multiple programs to reside in separate areas of core at the time.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.
is a method of allocating processor time.

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Operating System (OS)
Swapping

works best with many small partitions
None of these
does not work with overlaying
allows each program in turn to use the memory
allows many programs to use memory simultaneously

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