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INT 2F - Multiplex - NETWORK REDIRECTOR - UNLOCK REGION OF FILE
        AX = 110Bh
        BX = file handle
        CX:DX = starting offset
        SI = high word of size
        STACK: WORD low word of size
        ES:DI -> SFT for file
            SFT DPB field -> DPB of drive containing file
Return: CF set on error
           AL = DOS error code (see INT 21/AH=59h)
        STACK unchanged
Note:   called by DOS 3.1+ kernel
SeeAlso: AX=110Ah, INT 21/AH=5Ch