>When I create a form and put several tables into its Data Environment, is there anyway that I can check, from an event on the form, the number of tables in that Data Environment? I have created a form, using transaction processing, and in the form QueryUnload Event I need to loop through each table to see what changes the user has made. Any input would be greatly appreciated.

You can get DE object names using AMEMBERS(,2). Then you loop through the returned array and check for table objects only. Though I don't know how it would help you in QueryUnload.