Data centers can use the OPI option to restrict computer operators from overriding parmlib members specified in IEASYS00.
If OPI=NO is included in the IEASYS00 master member, z/OS does not let the computer operator enter the names of alternate general members during IPL. OPI=NO can also be set at the parameter level to prevent the substitution of parameters specified in IEASYS00 when the consolidated parameter list is built.
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