Volume 4 is a complete guide to programming with the X Toolkit Intrinsics, the library of C language routines that facilitates the design of user interfaces with reusable components called widgets. It provides concepts and examples that show how to use the various X Toolkit routines. The first few chapters are devoted to using widgets; the remainder of the book covers the more complex task of writing new widgets.Uses the Motif 1.2 widget set in examples and covers X11 Release 5.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./li>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 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, and the Athena widget set.