Operating System (OS)
The instruction register

contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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Operating System (OS)
Swapping

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

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Operating System (OS)
Trojan-Horse programs

are hidden programs that do not show up on the system
do not usually work
are legitimate programs that allow unauthorized access
usually are immediately discovered
None of these

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