INT 14 - Alloy MW386 v2+ - GET PORT NUMBER FROM LOGICAL PORT ID
        AH = 23h
        AL = logical port (01h COM1, 02h COM2)
        DH = user ID
        DL = process ID (DH,DL both FFh for current task)
Return: AL = MW386 port mode
            bit 0: port is shared (spooler only)
                1: port is spooled instead of direct (spooler only)
                2: port is assigned as logical COM device, not in spooler
                3: port is free
        CX = MW386 port number
        DH = owner's user ID
        DL = owner's task ID
SeeAlso: INT 17/AH=8Bh"Alloy"