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.
Unlike subway tokens, these were not coin-shaped. The most common scheme was a
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The secure-env-demo repo has everything you need to try both approaches. Clone it, pick the one that fits your setup, and run the demo app: