Both page table entries and segment descriptors have an Accessed bit that the hardware must set on use -- but the mechanisms are quite different.
Author(s): W. Dednam, E.B. Lombardi, Linda A. Zotti, C. Sabater
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Lego regularly runs make and take events in which participants can walk away with an exclusive set without spending anything. These free giveaways always cause a stir, but nothing gets the people going quite like Star Wars.，详情可参考同城约会
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