Hi,

> Is it possible to maintain Free Table History that from which system Open any Table.

Yes, but it might slow down the application quite a bit. The only way to get notified when a field changes in a table is an index expression on every field that calls a user defined function. In this function you would have to determine if the record changed. In case it does, store the new values in a history table. The problem with this approach is that index expression are evaluated much more frequently than just when you change a field. Your code might be called very frequently.

The only other solution is to make tables private to your application either by encrypting them or by using a different user account for your application.