X Toolkit Intrinsics Programming Manual. Motif 1.1 Edition for X11 R4. Definitive Guides to the X Window System Volume 4

Volume 4, Motif Edition, is a complete guide to programming with the X Toolkit (Xt), the library of C language routines that facilitates the design of user interfaces with reusable components called widgets. This book uses Motif rather than Athena widgets in its examples, and provides an overview of Motif functions to extend the Intrinsics. But it is equally applicable to and  provides a good introduction to programming with any widget set based on Xt, such as MIT Athena or AT&T's OPEN LOOK widget set. The Intrinsics underly all of these higher-level widget toolkits.
Volume 4 includes:
• Introduction to the X Window System.
• Building applications with widgets.
• Constructing a bitmap editor with widgets.
• An overview of each widget in the widget set.
• Basic widget methods.
• Events, translations, and accelerators.
• Event handlers, timeouts, and work procedures.
• Resource management and type conversion.
• Selections and window manager interaction.
• Geometry management.
• Menus, gadgets, and cascaded pop-ups.
• Miscellaneous Toolkit programming techniques.
• Comparison of Athena, OSF/Motif, and AT&T OPEN LOOK widgets.
This book is designed to be used with Volume 5, X Toolkit Intrinsics Reference Manual, which provides reference pages for each of the Xt functions, the widget classes defined by Xt.