MS-DOS 4.0

MS-DOS 4.0 stands for:

• MS-DOS 4.0 as the successor to MS-DOS 3.3, see MS-DOS
• MS-DOS 4.0 (multitasking operating system) (also European MS-DOS 4.0 ), separate development with multitasking capability

This is a disambiguation page for differentiating between several terms identified with the same word.