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Basics 
In the ABAP development environment, you use the Web Dynpro Explorer to create and edit Web Dynpro applications.
The Web Dynpro
Explorer has been fully integrated into the
ABAP Workbench and
does not have a separate transaction code. In the first processing step, you use the object
list selection and display an existing Web Dynpro component or create a new
one:

To create a new Web Dynpro component, enter a new name in the selection dialog of the object list, and select Display. In the dialog box that appears, you can enter a description of the new object and decide whether you want to create a Web Dynpro component or a Web Dynpro Component Interface.
You can find platform-independent information about
Web Dynpro and an introduction to the terms that are used in general in the
Web Dynpro
section of the Architecture Manual.