The section consists of a discussion of the programming interface, and covers only as much of the interface as programmers will need to get started. Much of the details can be found in the manual pages of the reference set.
For the most part, the discussion concentrates on the UnixWare implementation of ANSI standard C functions. Of course, UnixWare goes beyond the ANSI C standard in various other ways, most importantly in providing facilities for handling program messages in international contexts. In this regard, note that UnixWare offers two distinct approaches to message handling, only one of which is standard to X/Open. Although we describe both approaches below, keep in mind that the X/Open method is employed throughout much of Europe, so you can generally count on wider support for it than for the UnixWare-specific method. By and large, UnixWare internationalization is aligned with the X/Open Portability Guide Issue 4.