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Specifies whether ZDT/IMS functions which are using PSBs that have update intent use an IMS™ log when they are run in DLI mode and, if they do use a log, whether the log is kept when the function ends.
Use an IMS log. Keep the log when the function ends.
Use an IMS log. Keep the log if the function updates databases or does not end normally.
Use an IMS log. Keep the log only if the function does not end normally.
Do not use an IMS log.

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

If you do not want the user to override the value you specify for this parameter, set ULOGUSAG=N.