
In computing, protected mode, also called protected virtual address mode, is an operational mode of x86-compatible central processing units (CPU). It allows system software to use features such as virtual memory, paging and safe multi-tasking designed to increase an operating system`s control over application software. When a processor that suppo....
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http://en.wikipedia.org/wiki/Protected_mode

A mode of operation in the 80386 and 80486 in which it is possible to make use of the processor's architectural features for multitasking operating systems.
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http://osr600doc.sco.com/en/HDK_oddi/posunix_gloss.html

In Personal Computing, protected mode is an operational mode that an 80286 or later Intel processor can operate in. Protected mode was developed with the 80286 CPU to allow multi-tasking programs to operate on a Persoanl Computer. When a processor is operating in protected mode, each running program is allocated an area of memory. Any program attem...
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http://www.probertencyclopaedia.com/browse/GP.HTM
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