The hidden features of the Windows operating system, not described in the documentation, are considered, which significantly expand its functionality, making your work at the computer more comfortable, stable, productive and exciting. Presented are little-known programs and utilities included in Windows, with which you can solve various problems without resorting to utilities from external manufacturers. More than a hundred different settings are described, including those that can only be changed by editing the registry. Lists programs created by third-party developers to facilitate working with the registry. Described the ability to automate work on a computer using Windows Script Host.