CAVE (TM): CAVE Automatic Virtual Environment, a projection-based virtual
environment system that surrounds the viewer with up to four screens and
allows both physical and virtual objects to occupy the same space. The CAVE
is trademarked by the University of Illinois.

head-coupled: Displays or robotic actions that are activated by head motion
through a head tracking device.

head mounted display (HMD): A set of goggles or a helmet with tiny monitors
in front of each eye to generate images seen by the wearer as
three-dimensional. Often the HMD is combined with a head tracker so that the
images displayed in the HMD change as the head moves. (from Mancetta, Carol
and Blade, R.A. Glossary of.Virtual Reality Terminology.
http://ijvr.uccs.edu/manetta.htm)

monocular displays: display for one eye.

see through display: display that allows wear to see the virtual image
superimposed over the real world. The wearer can "see through" the virtual
image. (from Mancetta, Carol and Blade, R.A. Glossary of.Virtual Reality
Terminology. http://ijvr.uccs.edu/manetta.htm)

SID: Spatially Immersive Display: Spatially immersive displays utilize
wrap-around (panoramic) video displays to create an unencumbered, ultra-wide
field of view, walk-in immersive environment. Displays are typically
produced by front or rear surface video projection onto cylinder, dome,
torus, or rectilinear screens. High resolution over a wide field-of-view can
be maintained by projecting multiple video ports which are tiled or
soft-edge blended over the screen surface to create a continuous, seamless
or near-seamless, geometrically correct image when properly rendered. SIDs
may or may not utilize stereoscopy or head-tracking depending on application
requirements. (definition courtesy of Ed Lanz, Spitz Inc.)

shutter glasses: Glasses that alternately block out the left and right eye
views in synchrony with the computer display of left and right eye images to
provide stereoscopic images on the computer screen. (from Mancetta, Carol
and Blade, R.A. Glossary of.Virtual Reality Terminology.
http://ijvr.uccs.edu/manetta.htm)

Virtual Model Displays: Projected image tables that use headtracking and
shutter glasses to render 3D models with appropriate motion parallax to
appear to have a real presence on a tabletop or vertical surface. While head
tracking devices, haptic displays and SIGs are useful for exploring virtual
environments, VMDs are most valuable for working with virtual objects or
models that fit on a tabletop in the "real world." Less immersive than other
types of displays, VMDs are extremely effective when the goal of the system
is to establish a sense that an object exists and is positioned relative to
an observer and an environment. Known as "object-presence," this effect
requires high fidelity images and cues related to the object. It is
significantly enhanced when interaction with the virtual object is possible.

wearable computing: Wearable computing hopes to shatter this myth of how a
computer should be used. A person's computer should be worn, much as
eyeglasses or clothing are worn, and interact with the user based on the
context of the situation. With heads-up displays, unobtrusive input devices,
personal wireless local area networks, and a host of other context sensing
and communication tools, the wearable computer can act as an intelligent
assistant, whether it be through a Remembrance Agent, augmented reality, or
intellectual collectives. (from the MIT Wearable Computing WWW page)