X Window System User's Guide for X11 R3 and R4. Standard Edition. Definitive Guides to the X Window System Volume 3

The X Window System User's Guide orients the new user to window system concepts and provides detailed tutorials for many client programs, including the xterm  terminal emulator and the twm, uwm and mwm window managers. Once you have a basic  knowledge, later chapters explain how to customize the X environment and  provide sample configurations.
The X Window System User's Guide has been revised and updated for X11 Release 4. It includes:
• Starting the system and opening the first client windows.
• Using the xterm terminal emulator and the twm, uwm window managers.
• Most  standard release clients, including programs for graphics, printing, font manipulation, window/display information, removing windows, as well  as several "desktop" utilities.
• Customizing the window manager, keyboard, display, and certain basic features of any client program.
• Using and customizing the mwm window manager, for those using the OSF/Motif graphical user interface.
• System administration tasks, including managing fonts, starting X automatically, and using the display manager, xdm, to run X on a single or multiple display.