Mac OS X is evolving rapidly. There have been four major releases since it was first released as Version 10.0 in March 2001, and there is no sign that Apple is slowing down. To keep things simple, this book is targeted directly at Mac OS X Tiger (Version 10.4.2 was the most current version when this book went to press). While most of this information may work with previous or later releases of Mac OS X, there is no way to ensure this, and I’m certainly not going to pretend that I’m psychic and that the advice in this book will apply to the next release of Mac OS X (whatever big cat they name it after). Use this book with Tiger and you should be safe.