content: This book is excellent for understanding the "theory" of the Win 98 registry, but I have not found it very useful for guidance in the practical aspects of actually tweaking registry settings. It usually contains enough information about a particular registry section to know if it is not worth editing, but it often does not give enough coverage to important keys. It would definitely benefit a lot from input by a person who commonly solves problems using the registry. That said, I have sometimes found it helpful when trying to find which key contains a given piece of info that I am interested in tweaking.