Abstract: An architecture for the implementation of an information utility for accessing information and executing transactions on an interactive basis between Videotex databases and individual end user terminals, some or all of which may be remotely located with respect to each other. The utility may be associated with a Videotex Application Network (VAN) and includes a combination of distributed, semiautonomous Operations Nodes (ONs), each characterized by (1) one or more affiliated users, (2) the inclusion of some form of database, and (3) one or more customized application programs, and each is also capable of "standalone" operation. Each database comprises pages of control information and displayable data. Each node comprises a directory of databases at other nodes.

Abstract: An illumination and pickup device including a lucite head with an ellipsoidally shaped wall that is covered with reflective paint. An input source of light is positioned at a first focal line of the ellipsoidal head and the emitted radiation is internally reflected to form an intense slit image at the second focal line of the head. A circularly shaped cylindrical exit portion having its axis at the second focal line is cut at the emitting end of the ellipsoidal head. A flat surface positioned adjacent to the circularly shaped cylindrical portion and in the plane of the second focal line abuts an irradiated surface and thereby defines an alignment position for the ellipsoidal head. Optical fibers are affixed adjacent the cylindrical cut-out portion to receive the light that is reflected from the irradiated surface and to carry the light to a photodetector.