Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.
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A Home Office minister, Mike Tapp, has rejected claims that the government failed to adequately communicate new border rules that could see British dual nationals barred from boarding flights to the UK. The former Conservative cabinet minister David Davis said three of his constituents only became aware of the changes through reporting by the Guardian and the BBC. Under the new rules, British dual nationals must present either a valid or expired British passport, or a £589 certificate of entitlement, to prove their right of abode before boarding a plane, ferry or train to the UK，推荐阅读搜狗输入法下载获取更多信息