The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
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And here's how a far CALL uses a different test constant through the same subroutine:。关于这个话题，heLLoword翻译官方下载提供了深入分析
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