The purpose of the proposed course of lectures is a systematic presentation of the principles and techniques of programming in the Windows operating system in the Win32 API environment. The book describes in detail the basics of the organization of operating systems of the Windows family, the main functions of the Win32API environment, technologies for creating the main system elements of Windows. The presented examples of programs are made in the Microsoft Visual C++6 developer environment. The course of lectures is intended for students studying programming in the Windows operating system. It is possible to use this course for self-study of programming technologies in Windows, as well as a guide to Win32 API.