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Int 2F Fn 1681 - MS Windows 3+ - Begin Critical Section [W]
AX = 1681h
Notes: used to prevent a task switch from occurring
should be followed by an INT 2F/AX=1682h call as soon as possible
nested calls are allowed, and must be followed by an appropriate number
of "end critical section" calls
not supported in Windows/386 2.x. Get INDOS flag with INT 21/AH=34h and
increment by hand.
See Also: AX=1682h,INT 15/AX=101Bh,INT 21/AH=34h
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