Handling and explaining errors gracefully so as to have the least negative impact on a user's experience and workflow.

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Unknown page - what to do? Error or default (omision) page?

I'm currently working on a webpage whose links work as index.php?do=buy, ?do=sell, ?do=catalog, etc. However, I stopped for a second, and thought: what if someone changes it? (?do=idontexist) What ...