DOS, short for Disk Operating System, is a family of operating systems from different publishers that, at one point, were the primary operating systems used in personal computers and similar systems. The distinguishing feature of such operating systems is that they are usually primarily command line-driven, often lacking a GUI unless it is installed separately.
Microsoft Plus! for Kids·Microsoft Plus! for Windows 95·Microsoft Plus! for Windows 98·Microsoft Plus! for Windows XP·Microsoft Plus! for Windows XP: Digital Media Edition·Microsoft Plus! for Windows Vista·Microsoft Plus! Game Pack