Arranged in five sections - X protocol reference, Xlib reference, X Toolkit reference, Motif reference and general X reference - and organized alphabetically with thumb tabs for quick reference, this guide provides complete descriptions of routines and user-accessible data structures. These include: Xlib subroutines and macros; X Toolkit Intrinsics routines; Motif routines; and all of the Motif Widgets. This second edition has been up-dated to reflect new functionality in both X Window System Version 11, Release 5 and OSF/Motif Version 1.2, including: routines and Xlib to support color management system; and new routines on Xlib to better provide support for internationalization and localization.