Executing in a 320 x 240 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).