The following operator command affects CMEM rules as well as Control‑O rules:

This command affects CMEM rules in the following way:

• When ALL is specified, all CMEM rule tables defined in the CMEM list member referenced by DD DACTMLST are reloaded.
• When REBUILD is specified, all previously loaded CMEM rules are deleted as well as the Control‑O rules.

If REBUILD is not specified, previously loaded CMEM rule tables are either replaced by new copies or left unchanged.