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Use a user-opened display file with the open statement inside a monitor
section. When it is not a 132 wide screen, the on-error section should
be called and you can call a CL or other such program to display an
error. (You can't use a screen record in that same display file because
it won't open--it wants 132!)
That's been my experience, and as a matter of course I place that
monitor section near the top of my programs which require 132. I have a
separate CL that displays a little warning box explaining the error to
the user. They can press a function key to continue, and voila, no
errors or system messages blow up in their faces: they are simply
returned to the previous program/menu they were in.
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