Some initialization parameters are derived, meaning that their values are calculated from the values of other parameters. Normally, you should not alter values for derived parameters, but if you do, then the value you specify will override the calculated value.
For example, the default value of the
SESSIONS parameter is derived from the value of the
PROCESSES parameter. If the value of
PROCESSES changes, then the default value of
SESSIONS changes as well, unless you override it with a specified value.