APPX provides a structured framework for designing your application. This well-defined structure results in an application which is consistent in its design. With APPX you will be able to quickly design full-featured business applications which are maintainable!
The APPX Application Design Utility allows you to easily maintain more than one version of your applications. For example, you might have a production version, a test version, and a development version. And, you might have additional versions of your applications for each company or corporate entity within your organization.