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Effective tutorial systems can help promote products by reducing barriers of learning new applications. With dynamic web applications becoming as complex as desktop programs, there is a growing need for online tutorial/help systems. For visually impaired users the key limitations of traditional help systems are poor access to help content with assistive technology, and frequent reliance on videos/images to identify parts of web applications and demonstrate functionality. In this paper, the authors present a new interaction model, targeted towards screen-reader users, that describes how to embed an interactive tutorial within a web application. The interaction model is demonstrated within a system called DTorial, a fully functional dynamic audio-based tutorial with embedded content.
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