The Wireless Application Environment
At the application layer, external interfaces, APIs, and transport mechanisms provide one kind of description of a system. This is the perspective that interests application developers who must know how to access and how to interface to system software services.
Other perspectives describe other parts of a system. For instance, systems have state models, transaction processing models, and so forth that cannot be adequately described by a diagram such as Figure 11.1. At some point in the application design process, application developers need to understand these characteristics of the systems to which they interface.
Figure 11.2 is a logical schematic diagram that shows some typical system level components ...
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