For troubleshooting, the DDE query objects SQLStatus and SQLRetCode are available. They will be reset after every DDE communication and should be checked after every DDE communication. SQLStatus produces general warnings and errors, whereas SQLRetCode returns the error code of a failed database communication. If no error occurs during a DDE conversation, both DDE query objects return an empty string. If an error occurs, the corresponding error code is contained as a string in the particular DDE query object.