"Undocumented Windows NT is for developers seeking crucial information about the Windows NT operating system that hasn't presently been documented. This undocumented information will provide developers with more depth and insight into the Windows NT operating system, thus increasing their programming capabilities. This book covers topics, such as what types of debuggers to use, all the way to providing a listing of the internal undocumented NT kernel calls. It also covers both Windows NT 3.51 and Windows NT 4.0, and discusses both NT Workstation and NT Server. Many developers found Helen Custer's "Inside Windows NT book very informative and some would say it was the text book for NT internal architecture. "Undocumented Windows NT picks up where Helen Custer left off, adding details to what she only referred to briefly, and uncovering many "pots of gold" along the way. This book will cover the undocumented components of the Windows NT system, such as: Hooking the undocumented System Service Dispatch Table (SSDT) and providing the SSDT listing Adding NEW system services to Windows NT Hooking software interrupts in NT Flat thunking in Windows NT It is the authors' intention that this book follow in the tradition of the "Undocumented" series established by Andrew Schulman. "Undocumented Windows NT is the reference book for developers of the Windows NT environment, who are interested in pushing beyond the limitations of what has been documented, and are willing to venture into the unchartered waters of Windows NT.