Open Systems by Gary J. Nutt
The book describes the crucial elements of an open system within a framework of uniform issues: interportability across systems, portability and integration. It discusses the motivation for open systems, and the elements of a computer system that are affected by it: computer architecture; operating systems; networks; and distributed systems. This book is written to teach the diverse collection of topics that constitute open systems, and to serve as a reference book for the designer and implementer.