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The PIE subdirectory

We also include PIE (Prolog Inference Engine): the complete source code to a standard Prolog interpreter written in Visual Prolog. This interpreter is a great tool for learning more about how Prolog works and how you can add meta-language capabilities to your applications. You can modify this interpreter to create your own specialized logic programming languages, inference engines, expert system shells, or program interfaces.

PIE does also exist as a CGI Script, so you have a Prolog Intrepeter directly on the WEB! Run PIE on the WEB