The Microsoft Win32 Telephony Application Programming Interface (TAPI) version 2.1 provides services that enable an application developer to add telephone communications to applications developed for operating systems that support the Microsoft® Win32® API, such as Microsoft® Windows NT® Workstation and Microsoft Windows® 95.
The TAPI 2.1 Programmer's Reference is intended to help experienced programmers learn the API for telephony for these operating systems, and to be used by developers familiar with the Win32 programming environment. Previous development experience with telecommunications or other telephony applications is helpful but not necessary.