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Web Dynpro Application 
Another important
task of the window is to establish the connection between the structured view
group (or at least one individual view) and a URL that can be called by the
user. The window is also a unit called by a user using a
Web Dynpro
application. In general, only
one view is displayed on the screen at a time. In the simplest case, the Web
Dynpro application calls the view specified as the start view (default) within
the window. The user can navigate from this
start view to a subsequent view.
The Web Dynpro application is an independent object in the object list of the ABAP Workbench. For more information on creating and editing an application, refer to the tools manual in chapter Web Dynpro Application. For more information on the URL, refer to chapter URL of a Web Dynpro Application.
The connection between a Web Dynpro window and a Web Dynpro application is established by the interface view of a window. Exactly one interface view is automatically assigned to each window of a component and this interface view contains a default plug by default.

You can display each interface view in the ABAP Workbench.
The interface views
do not only connect the application to the window, but they and their plugs
have several more functions. As a
part of the
component
interface, they are also used when multiple components are to communicate
with each other. This is the
reason why they are described in more detail in several chapters of the second
part of the programming manual.