 Besides these public available services, generally without authentication, there were also several private services using the same infrastructure but using their own access-phone numbers and dedicated access-points.As these services weren't public you had to log into the infrastructure.The largest private networks were "Travelnet" which was an information and booking-system for the travel industry and "RDWNet" which was set up for the automobile trade to register the outcome of MOT tests to the agency that officially issued the test-report.