Once a week, the system uses the information in the daily processing file to update the subscriber master file. At this time, new subscriber names and addresses are added to the file, and the addresses of existing subscribers who have moved are changed. The system also prepares a Master File Maintenance Processing Report to indicate what additions and modifications were made to the file. Once a month, the company prepares postal labels for the magazine’s mailing. The subscriber master file serves as the chief input for this computer program. The two major outputs are the labels themselves and a Mailing Labels Processing Report that documents this run and indicates any problems.