The SET MMS command allows you to modify the MMS parameters that are currently in effect for your system, including the currently active CNLcccxx member. By selecting a MMSLSTxx member that specifies a different CNLcccxx member, you cause the system to refresh the current CNLcccxx settings. The new MMS and CNLcccxx settings take effect immediately (that is, without requiring a reIPL of the system). For more information about the SET MMS command, see z/OS MVS System Commands.