are to copy and to extend (append), with "slicing" being common enough that
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).
，更多细节参见同城约会
access. You might deposit your entire paycheck into an account, it might even
This story was originally featured on Fortune.com