A site can customize the SASRX exec to meet local requirements.
SASRX is designed so that it is possible to make most or all of your
customizations in a system configuration file or in the definitions
of options, and not in the REXX code. All SASRX options are defined
in a comment block at the beginning of the exec. Default option values
can be changed by specifying the preferred value in this comment block,
or a configuration file can be used to override the built-in default
values.