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INT 7F - Alloy MW386 - LOCK SEMAPHORE FOR USER
        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
SeeAlso: AH=42h"MW386"
See Also: 7F00
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