This report presents an evaluation of the usefulness of videotex for technical information services which is based on studies of a number of videotex systems operating in several countries, and a description of the structure and content of a database which has been introduced into the Finnish videotex system, Telset, by the Technical Information Service. This database provides the system with information on the Research Center and its work, and on the activities and organization of the Technical Information Service. Brief reviews of the three leading rival technologies in the field--Prestel (United Kingdom), Antiope (France), and Telidon (Canada)--are followed by descriptions and sample pages of databases providing scientific and technical, library, business, and governmental information which are available through a variety of teletex systems, including Contel (United Kingdom), Captain (Japan), Teletel (France), Bildschirmtext (West Germany), Viditel (the Netherlands), and Fintel (Finland). Videotex services provided by OCLC in the United States, and potential uses of videotex by closed user groups and in connection with other information retrieval systems are briefly noted. The usefulness of videotex for technical information is then discussed in the context of information retrieval, document delivery, and dissemination of information. A list of references and other related literature is included. (LMM)