The study of Windows API. Guidelines for performing laboratory work on the courses "Operating Systems" and "Operating" is an indispensable resource for students, graduate students and anyone who seeks to better understand the architecture of operating systems and programming for Windows. The authors, gathered in a team, offer readers a unique educational material that not only illuminates theoretical aspects, but also provides practical tasks, allowing to consolidate the knowledge gained in practice. From the first pages of the book, the reader plunges into the world of Windows API - an interface that is the basis for the development of applications in the Windows operating system. The guidelines are structured in such a way that they cover both basic and more complex topics, starting with the basics of working with windows and ending with interaction with system resources. Each laboratory work is accompanied by clear instructions and code examples, which makes the learning process not only effective, but also fascinating. This book will be of particular interest to technical students studying programming and operating systems. It is suitable for both beginners and those who already have some experience in software development. If you want to master the Windows API, learn how to create graphical interfaces or work with system calls, then this publication will become your reliable assistant. The topics raised in the book cover many aspects, such as memory management, file handling, event processing, and multithreading. These questions are key to understanding operating systems and developing high-quality software. The book also touches on application optimization and resource management, making it relevant to developers seeking to create effective and productive programs. The style of the authors is characterized by accessibility and clarity of presentation. They use clear examples and illustrations, which allows the reader to easily digest the material. In addition, the book contains tips and tricks that will help to avoid common errors when working with Windows API. This makes the publication not only a tutorial, but also a practical guide that can be used in the development process. If you are looking for books on programming, operating systems or Windows API, the "Learning Windows API" will be a great addition to your library. It will be useful not only for students, but also for practicing developers who want to update their knowledge or master new technologies. In conclusion, "Learning Windows API. Methodical instructions for performing laboratory work on the courses "Operating Systems" and "Operating" is a book that opens doors to the world of programming under Windows. It combines theory and practice, making learning fun and productive. Do not miss the opportunity to immerse yourself in the study of Windows API and expand your horizons in the field of software development!