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This document discusses developing multi-platform applications using Sencha Touch. It introduces Sencha Touch, which allows developers to build mobile web applications using HTML5 that can run on multiple devices. Sencha Touch uses a Model-View-Controller architecture, with separate components for the data model, user interface views, and application logic controllers. It also features a data store for managing application data. Contact information is provided for learning more about Sencha Touch and Craftbox, a company that specializes in HTML5 mobile app development.Read less