This reference manual contains materials on industrial samples of special equipment of domestic and foreign production, designed to protect information. In an accessible form, information on methods of protecting and controlling information using technical means is provided. More than 100 schematic diagrams of information security devices and objects are given, the logic and principles of operation of these devices are described, recommendations for installation and configuration are given. Methods and means of protecting information of personal computer users from unauthorized access are considered. Brief descriptions and recommendations for the use of software products and limited access systems are given.