If your installation shares the broadcast data set with other systems, you should customize the IKJTSOxx member of SYS1.PARMLIB to indicate the environment in which the LISTBC command will execute. If you have configured your system as a sysplex, and all of the systems in your global resource serialization complex are also members of the sysplex, you can avoid I/O on the broadcast data set for the display of system notices by setting the SYSPLEXSHR keyword on the SEND parmlib statement to ON. When the keyword of the SEND parmlib statement is ON, the LISTBC command communicates changes to the broadcast data set to the other systems using sysplex communication facilities.

If your installation shares the broadcast data set with other systems outside the sysplex, you should set the SYSPLEXSHR keyword of the SEND parmlib statement to OFF. When the keyword of the SEND parmlib statement is OFF, updates are made to the broadcast data set and are read from the broadcast data set.This ensures that all updates are observed by all systems sharing the data set.