Parse the WMI output to get Identifying Number.

def ParseMultiple(self, result_dicts):
    """Parse the WMI output to get Identifying Number."""
    for result_dict in result_dicts:
      # Currently we are only grabbing the Identifying Number
      # as the serial number (catches the unique number for VMs).
      # This could be changed to include more information from
      # Win32_ComputerSystemProduct.

      yield rdf_client.HardwareInfo(
          serial_number=result_dict["IdentifyingNumber"],
          system_manufacturer=result_dict["Vendor"])