The Online Bookstore sample application is designed using the Microsoft Windows Distributed interNet Application (Windows DNA) architecture application development model. The application is implemented in three layers a data layer, a business layer, and a presentation layer. The data layer represents the myriad of data sources distributed across the company’s enterprise system. The business layer consists of several components running in one Microsoft Transaction Server (MTS) package. This layer uses technologies provided by Microsoft SNA Server to access the mainframe and AS/400. The presentation layer is a Web site hosted on Microsoft Internet Information Server (IIS), which provides a thin client to the customer using a Web browser
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