---
title: "Work with VRPN"
canonical: "https://help.vicon.com/space/Tracker40/14190303/Work%20with%20VRPN"
format: markdown
---
The Virtual-Reality Peripheral Network (VRPN) is a library that provides an interface between 3D immersive applications and tracking systems used for Virtools. Vicon Tracker has a built-in VRPN server that streams data natively into these applications or will enable the development of simple interfaces using VRPN.


    **To turn VRPN output on or off:**


1. On the **View menu**, ensure **Connections** is selected**.**
2. In the Connections panel scroll within the **Output Setting **to the **VRPN** section's properties.
3. Select or clear the **Enabled** check box (selected by default).