Here, for advanced assembly-language and C programmers, is a book packed with high-level, comprehensive MS-DOS information, by Ray Duncan, featured columnist for Dr. Dobb's Journal. The first section is a richly informative overview of programming in the MS-DOS environment that covers disk file and record operations, disk directories and volume labels, MS-DOS disk internals, memory management, EXEC functions, installable device drivers, and much more. One reference section provides details on all the MS-DOS functions and interrupts, including descriptions and information on calling the functions, error codes, notes on the version-to-version differences and assembly-language examples. Other reference sections cover the Video Services in the ROM-BIOS and the new Lotus/Intel/Microsoft Expanded Memory Specification. ADVANCED MS-DOS -- all that a programmer needs to know!