Both the help for the ASP.NET User Interface Wizard and the ASP.NET Web Service Generation Wizard (part of the Viewer Studio help set) include sections describing host screen types and their behaviors.
If you are interested mainly in Web Service generation, please read:
Web Service Guide to Application Roles and Behaviors
If you are interested mainly in generation of an ASP.NET Web user interface, please read:
Web UI Guide to Application Roles and Behaviors
