The checkpoint command can also be abbreviated as cp.
JIO_OK ("jump if I/O OK") tests whether CPL ≤ IOPL. The same check gates PUSHF, POPF, INT n, and IRET. The monitor then emulates each instruction as appropriate: maintaining a virtual interrupt flag per V86 task, reflecting software interrupts through the real-mode interrupt vector table, virtualizing I/O accesses, and so on.
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"Often, it's difficult to know if that's related to the injection, or whether they had them originally but weren't assessed properly beforehand."