This document described the possibilities we have to interact in the VR using a CAVE as the interface between reality and virtuality. We could see that there are a lot of possibilities to accomplish this interaction, but only a few are practical enough to be used.
Still there is much to be done to find better ways for the VR interaction, and to improve the interaction methods we have.
Of course there will be many new possibilitys when technology evolves, especially in voice recognition will be done very much. But the computer systems of today are just too limited to let the borders between our real world and the virtual reality vanish.