SYS1.PARMLIB data set

You can simplify the installation process by specifying system defaults in members (IKJTSOxx) of the SYS1.PARMLIB data set instead of in tables. Using SYS1.PARMLIB members makes it easier to customize a system because installations need to change only one file. If you use tables, you must save them from one release to the next, and you must reassemble and link-edit them every time you make updates.

You can use SYS1.PARMLIB member IKJTSOxx to specify TSO/E system defaults for:

ALLOCATE, CONSOLE, HELP, RECEIVE, SEND, TRANSMIT commands
Installation-written TEST subcommands
TSO/E commands that run under the TEST command
Authorized commands and programs
Commands that users cannot run in the background
Commands and programs eligible for command or program invocation platform processing
The broadcast data set name because SYS1.BRODCAST is no longer the only broadcast data set name allowed
The password because up to 255 bytes are allowed to set for the LOGON password

To simplify the creation of the PARMLIB members, SYS1.SAMPLIB contains samples that a system programmer can copy to SYS1.PARMLIB and then change to suit the needs of the installation. For example, the IKJTSO00 member of SYS1.SAMPLIB contains samples of the statements you can use in the IKJTSOxx member. The changes to SYS1.PARMLIB take effect at the next IPL, or when you use the PARMLIB command.