If you do not code module-name in the MODIFY parameter, JES3 uses an installation default specified at initialization. JES2 provides no installation default at initialization.

If you do not specify trc, the default is 0. If the trc value is greater than the number of font-names in the CHARS parameter, JES2 uses the first character-arrangement table named in the CHARS parameter and JES3 uses the last character-arrangement table named in the CHARS parameter.