\ BooknewsAn introduction to the software of digital telephone exchanges, its functions, and architectures, addressed to engineers who have some general knowledge about switching systems and real-time software. The topics include detailed analyses of existing digital exchanges and their application software; alternative architectures for controlling digital exchanges; and unusual aspects of the software, operating systems, software engineering, and quality. Annotation c. Book News, Inc., Portland, OR (booknews.com)\ \