>I am slowly converting to using private datasession but most of my forms still use tables opened when the application starts. Is it possible to switch (on the fly) between a form's private datasession and the default datasession that is created when the application starts.
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>How is this done? Are there any gotchas?

SET DATASESSION will work safely if you use unbound controls, i.e. you separate data from interface. Bound controls can get very confused when you switch datasessions within a form.