Executing in a 420 x 182 pixel window, the Laszlo weather application is designed to run either within a regular browser or a handheld. The application features four screens: one input screen for entry of a U.S. Zip Code, and three display screens providing display of the returned weather data.
Each of the display screens is accessed via a "tabslider" interface element. Switching between tabs occurs in a visually continuous manner, with interface transition animations maintaining context. The application looks and behaves like a desktop software application, yet is deployed from a server.
In this example, the weather data source is an HTTP XML data feed (a simple XML Web Service). For more details about how this application was built, read the application overview (PDF).