Operating System (OS)
Trojan-Horse programs

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

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Operating System (OS)
A co-processor

Is quite common in modern computer
Causes all processor to function equally
Is relatively easy to support in software
Works with any application

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Operating System (OS)
Virtual Memory

allows multiple programs to reside in separate areas of core at the time.
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of allocating processor 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.
None of these

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