1) The document describes how to build a simple two screen WebDynpro application in ABAP to accept user input on the first screen and display it on the second screen.
2) Key steps include creating a WebDynpro component and views, designing the screens with labels, input fields and buttons, mapping attributes and nodes between views, and embedding the views in a window with navigation between them.
3) Testing involves creating a WebDynpro application from the component, saving without changes, and executing to view the input and output screens.