1) the iefutl exit has the final say, no matter what comes next because it's 
applied AFTER the job starts, This is the one I use because it works by task 
name or class and time of day and lots of other variables.
2) if no iefutl exit, then JES2 exit 6 has the final say, because it's after 
the JCL is read, and overrides any defaults
3) if no JES2 exit 6, the jobcard has the final say because it sets a value 
that overrides the defaults (which only apply if nothing is set)
4) if not on the jobcard, the jes2parms is the default setting.

That's the rules.  Some people will disagree with whether or not JES2 classes 
overide the jobcard, but they would be wrong.  Defaults only apply if nothing 
else is set.

Brian

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