An Open Application is a Web application that has been registered on the Yahoo! Development Network (YDN) and runs on the Yahoo! Application Platform (YAP). An Open Application is defined by a Gadget XML file.

As seen by the end user, an Open Application has multiple views, integration points, and components.

Figure 3.1. Anatomy of an Open Application details the composition of an application with its different Views, states, and locations.

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