NTOpenAddr(
  IN  tDEVICECONTEXT  *pDeviceContext,
  IN  PIRP            pIrp
  );
Routine Description:

    This Routine handles converting an Open Address Request from an IRP to
    a procedure call so that NbtOpenAddress can be called in an OS independent
    manner.

Arguments:

    pIrp - a  ptr to an IRP

Return Value:

    NTSTATUS - status of the request