This document provides information about different operating systems including MS Dos, Windows, Linux, Unix, and Apple Mac. It lists some common commands for MS Dos like Help, Cls, Net user, Start, and Exit. It then discusses features of the Windows operating system like the task bar, start button, how to check the date and time, and how to change settings. It asks several questions about using Windows relating to tasks like what to do if the computer freezes, how to restart or shut down, how to take screenshots, and differences between save/save as, copy/cut, image file types, and delete/shift delete.