Hi Gimmy;
That is correct .. but, application SQL updating its still part of many of these commercial tools. The only issue is that the SQL has to be in the form that these tools can parse and of course, the PBSELECT format in the DWO's are not.
I did write a utility to use to help people change or fine tune any DataWindow's SQL. The utility is called SqlXtract. SqlXtract will reconstitute the PBSELECT into normal SQL syntax that your app is using today and then output that in a text file. The text file can then be processed by these DML processing tools and then after being tuned and/or corrected, the resulting SQL can then be imported back into the DWO's.
Maybe that is the App you were thinking of?
Regards ... Chris