Normally what I do is tilt my head downward so that there's a shadow over my eyes, and either smile or make wide eyes (not too wide, just wide enough so that you look a little dead inside).
These might work: 1. Track and stare with your eyes directly at their face in a straight posture, kind of like a tiger stalking its prey, except you want to...
Most are plug-and-play if you have an fairly new (i.e. Windows 7 or higher) PC. If the NIC you are using is ancient, you will need to find drivers; otherwise,...