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Specifies whether or not IMS™ manages the runtime application control blocks (ACBs), as indicated by the ACBMGMT parameter in the CATALOG section of the DFSDFxxx PROCLIB member.
IMS does not manage the ACBs.
IMS manages the ACBs.

When ACBMGMT=CATALOG is specified, ZDT/IMS retrieves the DBDs and PSBs from the IMS catalog via the IMS catalog API.

This parameter is optional. If it is not specified on the HFM1POPI macro statement, ZDT/IMS uses either the value specified on the HFM1POPD macro statement (if specified on that statement), or ACBLIB (otherwise).

The user cannot override the value you specify for this parameter.