Document presenting the JDE structure or architecture

My customer just bought JDE and is looking for a white paper or a document that would present him the high level structure of JDE such as:

Distribution - Inventory

                   - Sales

                    - Purchasing

System 41 -42-43

Interactive programs or Batch program then versions.

My customer want an orverview on how JDE is structured and what type of objects to work with.

Thank you for your cooperation