Here's how to make a working Dll.
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1. Go to bookstore (I go to Barnes and Noble)
2. Go to the technology section.
3. Go to development
4. Find a book with the characters C++ on it. I recommend Sams Teach Yourself, Practical C++ programming, C++ Primer, and some book that was 900 pages of goodness.
5. Buy book.
6. Read book.
7. Finish Book.
8. Program.