VTAM® installations have several customization options available. SYS1.PARMLIB member TSOKEY00, or an alternate member, contains values used to initialize TSO/VTAM. You have the option to change these values. If you plan to use Session Manager, you may have to make additional changes to TSOKEY00 or the alternate member. For information about SYS1.PARMLIB members, see . For information about changes you may have to make for Session Manager, see Setting up a Session Manager environment.

Session protocols define the rules that VTAM uses to manage a terminal session. If you wish, you may change the protocols. For information about changing the protocols, see Defining and customizing TSO/VTAM and TSO/TCAM time sharing.

Some terminal keyboards may not contain all of the characters your installation needs. If this is the case, you can provide translation tables that allow users to substitute other characters for the unavailable characters. For information about providing translation tables, see Defining and customizing TSO/VTAM and TSO/TCAM time sharing.