A complete programmer"s reference for X library functions, which is the lowest level of programming interface to X. This reference manual provides reference pages for each Xlib function, a permuted index to the Xlib functions, reference pages for each event type, description of macros, a listing of the standard color database, an alphabetic index and description of structures and defined symbols, a list of keysyms and their meanings, a list and illustration of the standard cursor font, an illustrated list of the standard fonts, a function group index, for finding the right routine for a particular task, and single-page reference aids for the GC and window attributes.