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.
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
，这一点在雷电模拟器官方版本下载中也有详细论述
Жители Санкт-Петербурга устроили «крысогон»17:52
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