For now I have only the thumb, the course looks quite structured and comprehensive. The clear and concise explanations. But I noticed that in the openclassrooms site is Windows 8 that is used throughout the learning process. But this has not been updated on the book which is based on Windows 7. I find it a shame because it would have settled me whether on Windows 8 since I no longer Seven. Moreover the SDK used is also different from what I saw ...