INT 2F U - INTMON v2.1 - RESET
AX = 9E01h
Return: ???
Desc: this function specifies that INTMON should assume that any interrupts
on which it is currently awaiting a return have completed (i.e.
interrupts which never return such as INT 20 and INT 27)
SeeAlso: AX=9E00h,AX=9E03h