The "Microsoft MS-DOS 4.0 User's Guide and Reference," published by DTK Computer in 1988, serves as a comprehensive manual for users navigating the MS-DOS 4.0 operating system. With over 500 pages of detailed instructions, this guide provides invaluable insights into the functionalities and features of MS-DOS 4.0.While this edition does not include any discs, it remains an essential resource for individuals seeking to understand and master the intricacies of MS-DOS 4.0. From basic commands to advanced functions, the guide covers a wide range of topics, offering users the knowledge needed to effectively utilize the operating system.Despite its age, this manual is in great condition, making it a valuable addition to any collection of vintage computer literature. Whether for nostalgic purposes or practical reference, the "Microsoft MS-DOS 4.0 User's Guide and Reference" continues to offer valuable insights into the early days of personal computing.