> What am I adding with TIB_TransactionSource to my form?
> What am I missing if not?
> (same question about IB_ConnectionSource, of course ;)

By using a *Source component you can setup a form to be aware of
changes happening in a component located on another module. The
*Source components allow you to provide better isolation/independance
in your modules.

All the form/module code that responds to component events is attached
to the *Source component. The only "connection" to the external
component is the single property (and most of the IBO *source
components offer Before/After Assignment events so you can even
respond to changes in the connected component). This makes the
form/module code cleaner and more isolated, allowing you to make
changes to modules with minimal impact on other modules.

Much the same logic applies to DataSource, DataLink and various other
components.

I think that about covers it.

HTH

Geoff Worboys
Telesis Computing