Start the operating system will set up the bits referred to as "do not use" (0) when the user process references page. Bit references to this page, it will be to solve the hardware is "consumed" (1) from time to time, we may check to see whether the page is any page, which is not yet used by looking at the references a bit. Although we will not be able to know which page sequence is used before-after, but know that it is being used, or the us, they may have about the event or to mimic how the LRU.
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