Use the MODIFY CATALOG command to communicate with the catalog address space to display information or to request a specified service. Use this command only at the direction of the system programmer.
For complete descriptions, including under which circumstances to use and when not to use this command, see z/OS DFSMS Managing Catalogs.
When an operator issues any MODIFY CATALOG command, messages return to that console exclusively with one exception: for a MODIFY CATALOG,RESTART command, messages return to the console issuing the command and any consoles receiving routing code 2.