X Window System User's Guide for X11 R3 and R4 of the X Window System
by Valerie Quercia, Tim O'Reilly
Preface
By convention, a preface introduces the book itself, while the introduction starts in on the subject matter. You should read through the preface to get an idea of how the book is organized, the conventions it follows, and so on.
In The Preface:
Preface
The X Window System™ is a network-based graphics windowing system for workstations. It was developed by MIT, and has been adopted as an industry standard. The X Window System User’s Guide describes window system concepts and the application programs (clients) commonly distributed with Version 11, Release 4 of X. Because some commercial X systems still reflect X11, Release 3, we highlight important differences between the two.
Assumptions
This book assumes that X has already been installed on your system, and that all standard MIT clients are available. In addition, although X runs on many different types of systems, this book assumes that you are running it on a UNIX® system, and that you have basic familiarity with UNIX. If you are not using UNIX, you will still find the book useful—UNIX dependencies are not that widespread—but you may occasionally need to translate a command example into its equivalent on your system. The book also assumes that you are using a 3-button pointer, and that the operation of the twm window manager is controlled by the system.twmrc file from the MIT XII distribution (if this is not ...