I really couldn't understand fully what are you asking about but if you're not sure if the final product should be a web or desktop application maybe you can tr

I really couldn't understand fully what are you asking about but if you're not sure if the final product should be a web or desktop application maybe you can try developing using Flash environment. If you start as a webapp but then decide to switch to desktop you can just take the code from the swf file and put in into an Adobe Air application.