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One way I handle this is to show samples during an interview, but not leave
them. I explain that this is due to the fact that the manuals are
proprietary and that I would respect their documentation and
confidentiality just as much. If they can't respect that, they are
probably not very ethical.
I will explain what online help projects I have created, for what platform,
etc., but they will have to ask about the quallity of the work during their
reference checks. Again - confidentiality.