"Windows NT Server 4.0 Secrets" by Valda Hilley is a workbook specifically focused on the Windows NT Server 4.0 operating system. The book delves into the intricacies of this system, providing detailed information and guidance for users looking to maximize its potential. With Valda Hilley as the author, readers can expect a comprehensive and authoritative resource that covers a wide range of topics related to Windows 4.0 server administration. This book is a valuable tool for individuals seeking to enhance their knowledge and skills in managing Windows NT Server 4.0 environments.