This is an instruction guide to assembly language programming for 80X86-based computers. The author provides information on learning how to construct, process, and run programs. Experienced ALP programmers may learn more complex concepts such as interfacing with other languages, linking programs, DOS interrupts, and input/output. The author discusses interfacing with C and Pascal. This is a slow-paced, detailed guide to assembly language programming. It tells assembly language programmers what they need to know about Windows and OS/S programming. The author also gives programmers a better perspective on what they need to know to program at all levels.