One of the most significant features of MS-DOS 5 is its ability to effectively use extended and expanded memory to break the 640k barrier. This guide is aimed at DOS 5 users. The author provides information on the different types of available memory, describes how memory works and how to install it. It takes users through the step necessary to convert, configure and optimize memory with DOS 5. A special section covers DOS 5's memory abilities with Windows, offering tips on optimizing Windows' performance.