The 386 supports four privilege rings (0 through 3), though in practice nearly all operating systems use just two: ring 0 for the kernel and ring 3 for user programs. Three privilege levels interact on every segment access: CPL (Current Privilege Level), DPL (Descriptor Privilege Level), and RPL (Requested Privilege Level).
陳俊宏教授表示，真正影響人們對歷史認識的契機往往不在教科書，而在情感經驗，「情感上的交流是一個非常重要的媒介，讀了一本小說或看了一部電影的感動，都有可能觸發這個人進一步探索的可能性。」
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