Int 7F Fn 01  - Alloy Ntnx, Mw386 - Semaphore Lock                         [N]

   AH = 01h
   DS:DX -> ASCIZ semaphore name (max 64 bytes)

Return: AL = status (see AH=00h)
   AH = semaphore owner if status=02h

See Also: AH=00h,AH=02h,AH=41h