I won't go into detail here. The other reviewers have done a good job in that regard. Suffice it to say that this is an extremely good book, very well written. Horton explains things very well, clear and logical. I especially like, for example, his discussion of references, something which other authors seem unable to explain clearly. I've been following his step by step examples for using MFC, and they work well. Every step is presented in detail. Just do as your told and it works!
I do have one significant criticism. The book is almost 1400 pages long, and that is just too long to be convenient to handle. I would have preferred to have it be in the form of two volumes, Volume 1 being devoted to the C++ language and Volume 2 being devoted to the applications. I just find it to be physically awkward to read a 1400-page book.
Addendum as of 14 Feb 2010:
I have been using this book extensively now, and I'd like to add to my previous comments. This book covers a number of topics, the Integrated Development Environment(IDE), the C++ language, the Microsoft Foundation Classes (MFC) and the Common Language Runtime (CLR) for creating programs to run in the Windows environment. Each one of these topics is huge. Horton tackles the problem with a number of examples, the emphasis being on the development of a program called Sketcher for drawing objects on the screen. He devoted Chapters 13 through 19 to this program. He develops two versions of Sketcher, one illustrating the use of the MFC and the other the use of the CLR, the emphasis being heavily on the MFC. I developed the MFC version. The final version of Sketcher is a complicated program.
If you've ever followed a book to develop a program, you know that you will have bugs your program, and that it's important when you're trying to fix those bugs to be able to have confidence that the author's instructions are OK. I can tell you with certainty that you can count on Horton's being correct. If you truly follow his instructions, step by step as he describes, your version of Sketcher will compile and run OK. I recommend that, after you successfully complete the version in each chapter, you save it as something like SketcherCh13, SketcherCh14, etc. so that you'll have a good starting point for trying to sort out where you went wrong in each chapter. It is an amazing book.
I am, by no means now an accomplished Windows programmer. However, I am ready to start crawling on my own. I stand by by earlier comments.