This book in no way is a reference book or a how-to book. This book is designed for people who don't have previous knowledge about windows architecture and windows API.
I find this book as a fantastic tool since it gives me initiative and direction to understand the overall picture. I can use the knowledge that I gained in this book and know what I can do with win32 API. I also purchased the dan appleman's book for win32 api which consists of more examples and it is more a reference book .
If you have not programmed in win32 before --> this is the book for you.