The textbook is compiled in accordance with the requirements for the mandatory minimum content of the basic educational program for training specialists in the specialty 230105 "Software of computer equipment and automated systems" of the state educational standard of higher professional education. The purpose of the proposed manual is a systematic presentation of the principles and techniques of software development in modern operating systems in accordance with the work program of the discipline "Operating Systems". A high-level C++ programming language is used as the base language. The book discusses in detail the basics of building the basic elements of modern operating systems. Particular attention is paid to the principles of software development in Windows operating systems in the Win32API environment The training manual is intended for students of specialty 230105 "Software of computer equipment and automated systems" . It is possible to use this course for students of the specialty 220201 "Management and Informatics in Technical Systems" as a teaching aid for the study of system programming, as well as for self-study of programming principles in the Win32APl environment . Recommended for publication by the decision of the Educational and Methodological Council of Kamchatka State Technical University (Minutes No. 5 of March 21, 2008 . ).