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Int 31 Fn 0901 P - DPMI 0.9+ - Get And Enable Virtual Interrupt State [E]
AX = 0901h
Return: CF clear
virtual interrupts enabled
AL = 00h if previously disabled
= 01h if previously enabled
AH preserved
Notes: the previous state may be restored simply by executing another INT 31
a STI instruction may be used if the previous state is unimportant,
but should be assumed to be very slow due to trapping by the host
See Also: AX=0900h,AX=0902h
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