Using an IBM System/360 Model 50 computer, the New York Statewide Film Library Network schedules film use, reports on materials handling and statistics, and provides for interlibrary loan of films. Communications between the film libraries and the computer are maintained by Teletype model 33 ASR Teletypewriter terminals operating on TWX (Teletypewriter Exchange) service, programed mainly in S/360 Assembler Language. This configuration permits on-line (real time) tele-processing, the central concept in the system. The files (S/360 data sets) are stored on either direct access storage devices (disks) or sequential access storage devices (magnetic tape) according to their use in processing. Within the Network's system, there are three classes of files: system files, containing system programs and backup files; input/output files, containing tables for I/O editing and temporary I/O storage; and the data files, containing information about films, libraries, customers, and bookings. Appendices: list of files by sort sequence, notes on System/360 organization and data storage, and notes on disk storage devices. (TI)