Customization of the TSO/E environment generally refers to customization that makes a TSO/E facility available or customization that changes default values that affect TSO/E. You can customize:

• VTAM® -- You can change VTAM session protocols, provide substitute characters for unavailable keyboard characters, and override the default values used to start VTAM.
• Logon limits -- You can limit and manage the maximum number of concurrent logons, limit the user's region size, and limit user access to applications.
• The logon/logoff process -- You can change how often the system displays the logon proceeding message, limit the number of attempts a user can make at entering information in response to logon prompts, tailor the reconnect option, and suppress messages that are generated during the execution of the logon job. You can also review factors that affect logon performance, such as using STEPLIBs in logon JCL, and you can write exits to further customize the logon/logoff process. Your installation can use security labels (SECLABEL) if the proper products are installed.
• ISPF/PDF -- You can make ISPF/PDF available to TSO/E users.
• Authorized commands and programs -- You can select which authorized commands and programs users can use.
• Command/program invocation platform support -- You can invoke TSO/E commands and programs on the command/program invocation platform. Both authorized and unauthorized commands and programs are supported.
• Command availability in the background -- You can make specific commands unavailable for use in the background.
• TRANSMIT and RECEIVE availability -- You can make the TRANSMIT and RECEIVE commands available.
• HELP data set usage -- You can customize the use of HELP data set members.
• Host services availability -- You can make host services available to personal computer (PC) users.
• Language support -- You can provide information to users in their national language.