Explores the idea that the "interface" between an internal observer and the rest of his or her universe represents the sole reality that exists, for the observer. Discusses the implications of what it means to be a participatory observer in the universe and how that fact distorts the world, and examines the potential of experiments designed to expose features of the computer's interface reality in the real world. Looks at properties of quantum mechanics and the prospect of manipulating the real-world interface. Annotation c. by Book News, Inc., Portland, Or.