Before users can log on to TSO/E, you must give them access to the system. You must review and, if necessary, adjust the variables that limit the number of users who can be logged on at one time. You must also review the size of users' address spaces and, if necessary, change the size. You can specify a default size that applies to all users, a default that varies from one logon procedure to another, or a default that applies to individual users.

You must write and make available the logon procedures that give users access to the resources they need.