New sensor nodes will set off certain events when one enters specific areas, or click on certain objects. So, for example, as the viewer approaches an object it can be triggered to start some action or make a noise Collision detection ensures that objects can act as if solid. That is, the user, will not go through walls and floors.
Script nodes allow for the animation of objects in the world and the interaction of the world with other applications, for example databases Multi-user environments. There are many approaches to creating multi-user worlds, and the Moving Worlds aims to provide the functionality required for these, but without dictating which approach is to be used.