Methods, computer programs, and systems for interfacing a user with a computer program, utilizing gaze detection and voice recognition, are provided. A bar antenna element stands on the top cover in a slanting position. The apparatus, method, or system of lighting herein makes it possible to widely vary the types of beams from an available fixture using a small number of inventoried optics and fixtures. In the second mode, the redundant encoding is removed to provide more efficient use of the access control bit encoding space. The exchange systems also executes certain functions in response to commands and data transmitted from buyer sites, seller sites and institution sites.