A detailed description of how DOS memory and disk management work, up to version 6. The author discusses development tools, extended memory management, DOS/Windows interaction, the DOS boot sequence, the DOS/Doublespace interface, extended memory sources, device drivers, and error codes. A disk is included with complete source code in C and assembly language, including two libraries for turning almost any C program into a DOS TSR or device driver. Annotation c. by Book News, Inc., Portland, Or.