From HacDC Wiki
To operate, plug in headset and motion trackers to the gaming PC under the desk. Open steamVR; then put on the headset. Press the menu button on the controller and select your desired application.
For more information: https://en.wikipedia.org/wiki/Oculus_Rift
Make sure all cables are plugged into the adapter brick on top of the gaming PC. Open SteamVR and press the menu button on each controller; and put on the headset. Adjust headband accordingly, and open your desired application.
For more information: https://en.wikipedia.org/wiki/HTC_Vive