Yes..
dos operating system
There is nothing called lenovo DOS OS. DOS is the operating system which can be loaded in lenovo hardware..
DOS stands for Disk Operating System. To be useful computers have to have an operating system. The early IBM PC computers used the MS-DOS operating system. A DOS command is an instruction to the DOS operating system. It must be in a specific form. For example, the command DIR told the DOS operating system to list all files. These commands were typed at a place called the DOS command line. There a many such commands.
MS-Dos is Microsoft Disk operating System. The operating system for early IBM based computers.
MS-DOS Command promt is the third operating system
NO
DOS is just the operating system just like Windows XP. DOS SHELL is a program in DOS in which you can browse files and open them, etc. Just generally an easier way to move around the DOS operating system
MS-DOS is an operating system developed by Microsoft Corporation. Its called Microsoft Disk Operating System.
From 86-DOS
86-DOS
DOS is short for disk operating system.
MS-DOS Command promt is the third operating system