# Introduction

This document describes how to program Voicetronix computer telephony cards using the Voicetronix Voice Processing Board API (VPBAPI).

Unless otherwise stated, the term VPB (Voice Processing Board) will refer to all Voicetronix cards. The VPBs are programmed via the VPB Application Programmer Interface, a set of C/C++ callable functions. These are provided as a user-mode library (Linux & FreeBSD), or a Windows 32 bit DLL (Windows). This will be referred to as the VPBAPI, or just API.

For installation details please see the `README` file for your operating system, located in `vpb-driver/`.

Please refer to the README files, driver source code, and code examples for the latest information on using Voicetronix cards.