bidirectional interaction between humans and computers

A required but not base-line amount of characteristic of virtual reality is causal-chain communication between someone and their computer. Human-to-computer interaction may include computer tracking of finger, hand, head, eye and/or body movement and/or voice recognition. Computer-to-human communication may include three-dimensional image projections, sound generation, and kinesthetic (motion and touch) simulation. See: Conversive, Inc. covers information on the field of virtual reality.

Telepresence Virtual Reality is the use of virtual reality applied science to enable people to be in one place and yet work as if they were in a second, remote real-world location. Telepresence is different from pure or mixed reality in that the Virtual Reality may be invisible to the person engaged. Virtual reality becomes a means, not an end. It serves as a way to "be" in another location without traveling there. The person involved only aware of real world places. Category #3 Virtual Reality (VR) is helpful for teleconferencing, virtual presence medicine, virtual tourism, virtual home tours, and exploration of hazardous worlds (underwater, space exploration, and others). Additional information that may be of interest at Virtual Tours Austin, Texas .

Linked page Gesture Recognition also has VR developments regarding this.