This book is for programmers who are familiar with Release 5 of the X Window System and who want to know how to use the new features of Release 6. Intended as an update for owners of Volumes 1, 2, 4, and 5 of the O'Reilly & Associates X Window System series, it provides complete tutorial and reference information to all new Xlib and Xt toolkit functions.The book includes: An overview of the R6 changes as they affect application programming Preparing applications for Session Management New Xt features including signal handling and C++ support Creating multithreaded X applications Using transformed (rotated, scaled, or obliqued) fonts Internationalizing X applications An introduction to the X Image extension Together with Volumes 2 and 5, owners of the Programmer's Supplement for Release 6 have a complete set of reference pages for the current X Consortium standards for Xlib and Xt.