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Document execution begins at the first dialog by default.
As each dialog executes, it determines the next dialog. When a dialog doesn't specify a successor dialog, document execution stops. Executing a multi-document application. When this is done, every time the interpreter is told to load a document in this application, it also loads the application root document if it is not already loaded. The application root document remains loaded until the interpreter is told to load a document that belongs to a different application.