DOS is an acronym for Disk Operating System and refers to the PC operating system that existed before Windows (16 bit) or Win 32. This was known as Ms-Dos after Microsoft who wrote it.
Command line mode in Windows (accessed by clicking the Start button, then Run, then typing CMD and pressing return ) is often called Dos Mode or the Dos Console by older programmers.
DOS applications rarely use the mouse for input, instead relying upon the keyboard for input. Even until recently some professional Apps were keyboard driven for speed.
Glossary:
A B C D E F G H I J K L M N O P Q R S T U V W X Y ZInstead of a GUI application, I wrote a Dos Console application.

