The fifth edition of Operating Systems: A Systematic Approach by Bill Davis and T.M. Rajkumar provides an applied introduction to operating system concepts. It is aimed at those who are interested in using, rather than designing, computers, operating systems, and networks. The intent is to show why operating systems are needed and what, at a functional, black-box level, they do. This edition guides students through some of today's most widely used operating systems, including Linux, UNIX, and Windows 2000. This book is ideal for introductory courses where students are only required to have a working knowledge of high school algebra.