IPCS is shipped with certain session default values. When you begin your first IPCS session, or whenever you start a session with a new user dump directory, IPCS establishes these defaults. See the SETDEF subcommand in z/OS MVS IPCS Commands for a list of the default values supplied with IPCS.

IPCS maintains your default values from one session to the next. Thus, the defaults in effect at the end of your IPCS session will still be in effect the next time you start IPCS, provided that you use the same user dump directory. These defaults remain in effect until you explicitly change them.

By taking the time to set the session defaults when you begin your first IPCS session, you can avoid having to specify them on each subcommand to which they apply.