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Defining a Web Dynpro Application 
The execution of a Web Dynpro application starts in the Web browser; the visual part of one Web Dynpro component (the root component of this Web Dynpro application) is displayed. The visual parts of a Web Dynpro component, which can be used from the outside, are the windows, of which exactly one is linked to the Web Dynpro application using the interface view of the window.
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1. In the Web Dynpro Explorer, choose Create Application in the context menu of the Applications node in your project.
2. Specify a descriptive name for the Web Dynpro application, for example WelcomeApplication, and choose Next.

3. Choose Use existing Component and Next.
4. Select the only available value for the Web Dynpro component, the interface view, and the startup plug.
Your first Web Dynpro project now has callable Web Dynpro application.
Based on the achieved state of the underlying
metadata for the Web Dynpro project, you can now generate corresponding Java
source code files. After these have been compiled, you can start creating a
development unit that you can deploy in the SAP J2EE Engine. Next step: Deploying a Web
Dynpro Project.
