This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
No, the docs say that those are values pre-defined by ActionSupport (technically the Action interface). That says nothing about *having* to return them. They're result names: you can name your results "fred" if you want.