This report describes an experimental system for remote direct access to files of computer-stored information which has been indexed by the Universal Decimal Classification (UDC). The data base for the experiment consisted of references from a single issue of Nuclear Science Abstracts. The Special Subject Edition of UDC for Nuclear Science and Technology was also stored in the computer so users could discover how to translate their questions from natural language to logical statements containing UDC numbers. The author conclude that the technical feasibility of use of existing classification and indexing tools, such as UDC, has been demonstrated. However detailed attention to all facets of man-machine communication is a necessity if systems are to be designed which will be voluntarily used. AUDACIOUS is reviewed and criticized from this point of view. The authors also conclude that the use of UDC in an on-line, interactive system may have important ramifications for the development of international information networks. Conversion tables (schedules) already exist which would allow speakers of many languages to search files indexed by UDC without regard to national or linguistic boundaries. (Author)