IRLM

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         .-IMS-.   
>>-IRLM=-+-Y---+-----------------------------------------------><
         '-N---'   

IRLM
Specifies whether or not ZDT/IMS functions uses an Internal Resource Lock Manager (IRLM) when running in DLI mode.
IMS™
IRLM is used if either the IMSCTRL macro statement specifies IRLM=Y, or the IMSCTRL macro statement specifies an IRLMNM and does not specify IRLM=N.

IRLM is not used if either the IMSCTRL macro statement specifies IRLM=N or the IMSCTRL macro statement does not specify a value for IRLM and IRLMNM.

Y
IRLM is used.
N
IRLM is not used unless the IMSCTRL macro statement specifies IRLM=Y and an IRLMNM.

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 IMS (otherwise).

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