This kind of information should be handled at application level.
You could use dedicated items to carry metainformation to the client;
the client can receive them through a NonVisualTable, hence the whole processing is demanded to application code.

Note that the Failure method is about technical problems in the Data Adapter that could be resumed only through a full closing and restarting.
Also note that Control.txt is not part of the Web Client Interface; by the way, are you using a Moderato license or an evaluation account?