Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.
goes to zero it can be returned to the operating system
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unsigned short unused;
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This article originally appeared on Engadget at https://www.engadget.com/science/space/new-webb-telescope-photos-show-off-the-exposed-cranium-nebula-235609619.html?src=rss
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