With the help of this book you will learn how you can work on the same computer on several operating systems at once. At the same time, operating systems are run in separate windows, as usual programs. This is done with the help of special technologies and programs described in the book (so-called virtual machines). This has many advantages. First, you will be able to simultaneously use the features and programs of moms of different systems (Windows, MacOS, Linux, etc.) d. ), without rebooting the computer. Second, you can set up separate operating systems for different tasks. For example, you will have one system designed for the Internet: as a result, you can not be afraid of viruses, since you can always get rid of the system running in the window by simply closing the window. The virus will not have any effect on the main system. Another system can be made to work by installing appropriate programs on it. Third, you can create secret operating systems. Fourth, system recovery and backup will take 1 minute. Finally, it solves the compatibility problem. For example, you have Windows 7, and the desired program works only under Windows XP. You will be able to run Windows XP in a separate window, and in it - the required program. You do not have to install Windows XP separately and reboot each time to use the program under Windows XP, and then reboot again to return to Windows 7. The book is written in a simple and accessible language with many step-by-step instructions and visual illustrations.