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>>We use the COM mode. So, by default WWC does not include the SYS(2335) command. If I understand correctly, I should add this at the upper level somewhere. Does that mean, if in the code, I forgot to open a tabe for example, this will never happen again as the control will be returned immediately at the error level?
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>Add this at the Init of your main COM object or each COM object called by WWC.
>Yes, the control will return immediately to the error handler instead of Open dialog box in unattended mode. Just read help for SYS(2335), there is a table with situations of dialog boxes, it includes the open dialog box too.

Thanks a lot, I'll keep you inform when I'll be able to test it.