A troubleshooting handbook that lets the programmer take control of the PC includes programming examples, a task-oriented reference to the DOS operating system, and direct hardware access techniques.
Very Good book, during my College (1994-1998) days this was the foundation of my C/Assembly Language explorations. Was able to create my own GUI program from scratch using Turbo C. In fact I've gotten my self a used copy of this book from eBay and is now part of my Book Collection.