Splitting the Technologies
In the mainframe-only world, each information systems subgroup (e.g., applications, technical support, etc.) handled its respective technical responsibilities in a coordinated manner, but the system and application software were designed to run basically separate from each other. The integration between the application layer and the system software layer was designed to be hierarchical, such as by permitting the applications group to develop programs and pass the source code to the production environment for compilation. System administration was not a concern for the applications programmer. This is not true in the client/server world.
Client/server technology is divided into three layers: presentation layer, business-code ...
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