Well, it's a lot like any other web development client. Specifically I'm reminded of a situation at a company I worked at where a group of senior employees wan

Well, it's a lot like any other web development client. Specifically I'm reminded of a situation at a company I worked at where a group of senior employees wanted a Sharepoint Wiki set up that it was impossible for anyone to print, email, or otherwise share the contents of. We couldn't very well say what we were thinking, which was "are you stupid?" So we gave them a wiki, told them that people would be able to share the contents of it, and let them have at it. There's no point in arguing when a client gives you legitimately impossible requirements. You just say "That can't be done." and let the client deal with it.