The MSTRJCL parameter in the IEASYSxx parmlib member specifies
the data set that is to contain the master JCL:
- If the system finds a MSTJCLxx parmlib member with a suffix that
matches the value specified or defaulted on the MSTRJCL parameter,
it uses the master JCL in the MSTJCLxx parmlib member and does not
process the MSTJCLxx load module in SYS1.LINKLIB.
- If the system does not find a MSTJCLxx
parmlib member that matches the value specified or defaulted on MSTRJCL,
it uses the master JCL in the corresponding MSTJCLxx load module in
SYS1.LINKLIB.