Optional customization enables you to change or extend the capabilities of TSO/E functions or to make other IBM® products available to TSO/E users. This topic introduces the kinds of optional customization you can do. Other topics provide the detailed information you need to do a particular customization task. This topic introduces how you can:

• Customize the TSO/E environment, which includes: customizing VTAM®, defining logon limits, customizing the logon process, making commands and programs available, specifying commands not supported in the background, specifying commands and programs to run on the command/program invocation platform, customizing HELP data, making host services or ISPF/PDF available, setting performance objectives, monitoring and protecting TSO/E resources, and customizing TSO/E for different languages
• Maintain the UADS, the broadcast data set, and the RACF® data base
• Customize the use of commands
• Customize CLIST and REXX processing
• Make Session Manager available and customize the Session Manager
• Make the Information Center Facility available and customize the Information Center Facility.