[en] Described is the organization of information servicing in the COSDES system intended for controlling the operation of scanning measuring projectors when processing the photographs obtained from bubble chambers. The system is designed for operation on-line with the DEC-10 computer. The information servicing in the COSDES system implies the formation of tasks on the film processing for each projector connected to the system, provision of the operator accompanying programs (AP) with input information on the photograph (frame) processed, recording of the operator and AP working results on a magnetic tape and preparation of the entries for the data file, acquisition of statistical data on the work of operators, projectors and real-time system