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).
As she exited the event center where the deposition was held, Hillary Clinton told reporters that Maxwell had come to the wedding as a guest of someone else and that she had told the committee she only knew Maxwell “as an acquaintance.”
，这一点在WPS官方版本下载中也有详细论述
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