VRML 2.0 Binding Concepts

Certain nodes have a stack associated with them onto which they may be pushed and popped
The node at the top of this stack is applied to the scene (there is always a default)
The set_bind event sent to a bindable node, pushes or pops it
The list of bindable nodes is:
- Background
- Fog
- NavigationInfo
- Viewpoint
Don't worry - you can't do any damage by popping too many times