Although the IBuySpy Portal application is fairly simple, it makes use of ASP.NET's great features. And because of this, the plumbing that holds the program together wasn't on the developers' shoulders because it's baked into the .NET Framework.
In this chapter, you've learned about the portal's architecture. You've also learned about how the tabs work and how they maintain the organization of the program. You learned about style sheets, and how to add your own tabs and modules.
There are several downloadable projects from www.ASPNET-solutions.com that illustrate many of the things we talked about and you learned. These will help you fully understand the IBuySpy Portal, and I encourage you to download them. A white paper on the portal is available at http://www.asp.net/ibuyspy/portalpaper.aspx?tabindex=5.