20.3. The Presentation Tier
In an n-tier application built to the Windows DNA model, the user-services tier handles presentation of information and interaction with the users. The first tier is referred to as "presentation services" because some of the services performed in the middle (business) tier of an application, such as authenticating users, are using services as well. It is probably best to think of the presentation tier as the client that you will deploy on a user's desktop. In Windows DNA, you build and deploy clients along a continuum, from thin clients to rich (or thick) clients. This continuum classifies clients in terms of the functionality they present and their dependencies in a given environment.
Figure 20.3 shows how these clients ...
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