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Window 
A Web Dynpro window groups together multiple views and view sets. A view can only be displayed by the browser if it has been embedded in a window. A window always contains one or more views, which are connected by navigation links. One of these views, or a view set, is specified as the default start view and is displayed the first time the window is called.

Each window has a uniquely assigned interface view. This interface view represents the outward view of the Web Dynpro window. The interface view is linked with a Web Dynpro application so that the window can be called using a URL.

