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TAPI Server.

Microsoft definition: The central repository of telephony information on a user machine. This service process tracks local and remote telephony resources, applications registered to handle Assisted Telephony requests, and pending asynchronous functions, and it also enables a consistent interface with telephony service providers (TSPs).

On Windows 95, Windows 98, and Windows NT, TAPISRV runs as a separate service process. On Windows 2000, it runs within the context of Svchost.exe. When an application loads a TAPI DLL into its process space and performs an initialization operation, the DLL establishes an RPC link to the TAPI Server. The TAPI Server loads telephone service providers (TSPs) into its process space. Regardless of how many applications access a given provider's devices, only one instance of a given TSP will exist.