All right! You now understand the basics of the new application model. You ve learned how to use markup to create a UI declaratively , albeit a very simple UI. You could write the equivalent of Web pages using XAML files and deploy those files to a server for a user to browse. However, scenarios that are more interesting will typically require you to compile the application before deploying it. So let s jump right in and learn how to build and deploy a Longhorn application.