This book is for programmers who are familiar with Release 4 of the X Window System and want to know how to use the new features of Release 5. It is intended as an update for owners of Volumes 1, 2, 4, and 5 of the O'Reilly and Associates X Window System series, and provides complete tutorial and reference information on all new Xlib and Xt toolkit functions.It includes: Overview of the R5 changes as they affect application programming. How to write an internationalized application---one that anticipates the needs of a language and culture other than English. How to use scalable fonts and the fonts provided by the new font server. How to get consistent color on any display by using the X Color Management System. Overview of PEX, the new three-dimensional graphics extension for X. Reference pages for all new and modified Xlib and Xt functions and Athena widgets. Together with Volume 2 and Volume 5, owners of the Programmer's Supplement for Release 5 have a complete set of reference pages for the current X Consortium standards for Xlib and Xt.