Data files are the key to effectively using microcomputers for virtually all business, classroom management, professional and sophisticated home applications. Yet surprisingly few micro users understand how data files work, and fewer still are able to set up and maintain them for their own use. This easy-to-follow book is the first self-instructional manual designed for the thousands of business and professional users and computer hobbyists who want to add this powerful tool to their computing capabilities. It shows you in comprehensive and comprehensible detail how to program and maintain data files on microcomputers, and how to write data file programs that are readable, efficient, and useful.