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CUPS and error dialogs

I can't seem to get CUPS print jobs to display any kind of error dialog like Tioga drivers are able to do.

For example, the following lines of code in my main() don't seem to do anything:

fprintf(stderr, "ERROR: This is a bad error\n");
return 1;

I was expecting to see the OS display some sort of alert indicating the print job failed, but that does not happen.

Am I missing something?

Thanks,
Dave
---
Among the chief weapons of UNIX: Fear, surprise and ruthless efficiency.
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