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Int 7F Fn 41  - Alloy Mw386 - Lock Semaphore For User                      [N]

   AH = 41h
   AL = user ID
   DS:DX -> ASCIZ semaphore name

Return: AL = status
       00h successful
       01h invalid function
       02h semaphore already locked
       03h unable to lock semaphore
       04h semaphore space exhausted

See Also: AH=00h,AH=42h"MW386"
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