As you can imagine, this system was quite complex and took many months to build even the first version. However, once completed, it was a huge success with dentist/ortho offices around the country and now my friend is a very wealthy and basically retired individual.
Workflow-based systems such as this are now much easier than ever to design and build with the product we announced yesterday at the PDC - Windows Workflow Foundation. Using the Windows Workflow Foundation, architects and developers can engineer and implement complex systems that execute a wide variety of stateful, long-running, persistent workflow applications that includes both computer-based as well as user-based actions. For more information, I would recommend reading the following whitepapers and articles: