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Processing Process 
The internal structure illustrated below underlies the BSP application with the interface just described:

The arrows represent navigation paths between the pages.
A user can navigate from any page to the pages search.htm, basket.htm, newuser.htm and about.htm, as these links are always visible in the title bar head.htm.
For information on the data model in the SAP System, see section Data Structures.
An overview of the new Online Bookshopfunctionality is given under What’s New?. The functionality is described in detail in Extending the Online Bookshop.

For background information on the structure of BSP applications and how they work, see the following sections of the BSP reference documentation:
Structure of a BSP Application
Now you can get started with creating your BSP application.