Local or Distributed?
Do not be fooled by the apparent distribution of the disconnected layers in a multitiered architecture. Programming with tiers does not imply a distributed relationship or even the presence of a database. It is a road map to follow and can be used for any application. Some applications do not even require a presentation layer. They might be services, for example, listening for non-interactive requests. Likewise, a data services tier can be absent if the application doesn't involve persistence (like the calculator usually found under the Accessories menu in Windows).
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