This book is exactly what the title implies. It is a reference book for system administrators. It is not everything on NT or it would have to be three feet thick. It is not just a theory book. There are practical steps with clear graphics on how to. How to what you ask? How to do the things needed by an administrator and shows the administration tools needed for such items as Backup, DHCP, Disk admin, and DNS Manager Internet service. Because the NT is not as intuitive and straightforward as UNIX you need a book like this to tell you what they were thinking when they put NT together.