Here is a list of the keys you use to navigate:
arrow keys - body movement
mouse movement - head movement
mouse click - launch "hotspot"
Esc - quit the game
When you're exploring the 3D environment you will notice pulsating blue areas scattered throughout, as well as bouncing symbols. These are "hotspots" that you can click to find out more information about that part or concept. When you click the hotspot it will open the Lesson Browser containing the relevant information.