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).
Now the U.S. Customs and Border Protection agency must come up with a way to process the refunds. Customs routinely refunds tariffs when there’s been some kind of error, but its system was “not designed for a mass refund,″ said trade lawyer Alexis Early, a partner at Bryan Cave Leighton Paisner. “The devil will be in the details of the administrative process.″
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