This release is meant to demonstrate how to quickly interface with the Hairball eye tracking system. Here you can see how to supply the x,y,z eye position coordinates, x,y gaze coordinates, data quality variables, and version information.
This particular example with cause Hairball to gaze in a circular pattern with constant velocity. To see how an actual eye tracker is implemented, see the https://github.com/ryklin/MyGazeDLL_EyeX sample.