Abstract: Methods, systems, and computer-program products are disclosed. A cross-platform application can access a platform identifier indicating a characteristic of a computing system in response to beginning execution of the application. User interfaces can be provided interface based at least in part on the platform identifier and an interaction model, with the interaction model used to define the layout and content of the interface. The model can be separate from the program component that provides the user interface, and so the application can customize at least some aspects of its output for different platforms based on the platform identifier. Embodiments also include the use of screen-based application navigation.