Building Distributed
Applications
Using the Progress AppServer
The Two-tier Model
Traditional client/server development is based on a logical and physical two-tier computing model. It is deployed across two machines and connected through a network. The user interface and application logic are tightly integrated and located on a client machine, while the data resides on a separate server machine.
Figure 1–1 shows this two-tier configuration. Often, the client application runs on a limited desktop machine; the real computing power is reserved for the server.
Figure 1–1: Two-tier Model
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Although applications based on this model are relatively easy to build and maintain, they are generally limited in size and computing power. These limitations can restrict the possibility of increased performance capabilities.
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