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Int 60 Fn 12 - 3com, 10net, Banyan Vines - Lock [N]
AH = 12h
AL = drive number or 00h
ES:SI = Ethernet address or 0000h:0000h
DS:BX -> 31-byte ASCIZ semaphore name
Return: AL = status (see also AH=11h)
01h semaphore currently locked by another PC
Note: unlike function 11h, this function returns immediately
See Also: AH=11h,AH=13h
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