9. Run simple TTY systems
9a. Single user access
9a1. On a serving host
9a1a. A to B
9a2. From a using host
9a2a. A to B
9b. Multiple user access
9b1. On a serving host
9b1a. A,C to B
9b2. From a using host
9b2a. A,A to B
9b3. Various combinations
9c. Login, logout, in and out of subsystems
9d. Handling of error messages, crashes, recoveries
9f. Establish protocols
9g. File storage and retrieval
9h. Need user's guides for each site
9i. Need to establish usage schedules
9j. Need to set user names
9k. Design and build comm exec or its equivalent