20.4. Business Services Tier
In n-tier application development, the business-services tier provides most of an application's functionality. This tier handles the bulk of application-specific processing and enforces an application's business rules. Business logic built into custom components bridge the client environments and the data-services tier. The business-services tier is implemented as both a set of server applications and a run-time environment for COM components. This tier includes Microsoft BackOffice Server products, such as Microsoft Transaction Server, Microsoft Internet Information Server, and Microsoft Message Queue Server. In addition, this tier hosts the Active Server Pages (ASP) pages that the client calls. ASP pages contain ...
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