A dynamic and interchangeable set of application behaviors is implemented upon the same underlying software engine. Downloadable data provider behavior descriptors configure the UI generation application dynamically on demand to meet needs that are unknown at ship time, or otherwise cannot be predicted in advance—inputs, formats, contents, and the optimal user interface or experience, all change over time. A data provider supplies the data source locations, data feeds, poll/pull intervals on feeds, parameter definitions, data binding definitions, lists, groups, UI templates, data transformation logic, resources, and UI templates to plug into the base application engine, which transforms the supplied data to create a UI experience tailored to match the appropriate events and available data over time. The base application engine is agnostic to both the data provider and the input data received.