Opus Book Test English (Gimmicks and Online Instructions) by Denis Marc Paret - TrickThis gem of technology, it's an INTELLIGENT MARKER that will allow you to perform miracles. Imagine the following: You are presenting two books to the public. A dictionary of more than 1100 pages (For each language, the number of pages may differ from country to country). A novel of about 300 pages. The viewer chooses a book. You ask him to open this book to any page and give you the page number. IT IS VERY IMPORTANT TO UNDERSTAND THAT THE SPECTATOR