>I don't have a clear idea whether it is possible to separate components of my application in different files (EXE or APP), and make them all work together as if it were a single program. For instance, would SET PROCEDURE TO MyApp.APP give access to all components of the APP? Or do I need something else?
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>TIA, Hilmar.

From our experience you don't have to do anything. If the application one APPL1 invokes the application 2 APPL2, the second application automatically is added to the project in Code/Applications and it's excluded, so the changes in the second application would be reflected in the first one.