IN  PVOID             pDgramEventContext,
  IN  int               SourceAddressLength,
  IN  PVOID             pSourceAddress,
  IN  int               OptionsLength,
  IN  PVOID             pOptions,
  IN  ULONG             ReceiveDatagramFlags,
  IN  ULONG             BytesIndicated,
  IN  ULONG             BytesAvailable,
  OUT ULONG            *pBytesTaken,
  IN  PVOID             pTsdu,
  OUT PIRP             *pIoRequestPacket

Routine Description:

    This routine is the Name Service datagram event indication handler.
    It gets all datagrams destined for UDP port 137


    pDgramEventContext      - Context provided for this event - pab
    SourceAddressLength,    - length of the src address
    pSourceAddress,         - src address
    OptionsLength,          - options length for the receive
    pOptions,               - options
    BytesIndicated,         - number of bytes this indication
    BytesAvailable,         - number of bytes in complete Tsdu
    pTsdu                   - pointer to the datagram

Return Value:

    *pBytesTaken            - number of bytes used
    *IoRequestPacket        - Receive IRP if MORE_PROCESSING_REQUIRED.
    NTSTATUS - Status of receive operation