PLPCP_MESSAGE
LpcpFindDataInfoMessage(
  IN  PLPCP_PORT_OBJECT Port,
  IN  ULONG MessageId,
  IN  ULONG CallbackId,
  IN  LPC_CLIENT_ID ClientId
  );

Routine Description:

    This routine is used to locate a specific message stored off the
    data info chain of a port

Arguments:

    Port - Supplies the port being examined

    MessageId - Supplies the ID of the message being searched for

    CallbackId - Supplies the callback ID being searched for

Return Value:

    PLPCP_MESSAGE - returns a pointer to the message satisfying the
        search criteria or NULL of none was found