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MS-DOS ended with Windows NT. It used file command.com to interpret all DOS commands. Win 2000, XP, Vista use a DOS Shell which emulates DOS but is not really DOS.
MS-DOS 6.22 was the last stand-alone version of MS-DOS. Some believed that MS-DOS 7.0 was the last version of MS-DOS since Windows 95 reported MS-DOS as MS-DOS 7.0. However, this was just a shell in Windows and not a stand-alone version of MS-DOS.
The major competitors were MS-DOS and PC-DOS; Microsoft and IBM. There also was an AppleDOS on early Apples; so there were at least 3 DOS'.
Windows Mac OS X MS-DOS VxWorks QNX MS-DOS DR-DOS AmigaOS
DOS by default is not capable of multi-tasking. However, there are some shell and TSRs designed to allow you to switch between different DOS apps.
Dos Dedos Mis Amigos was created in 1993.
Dos amigos y un amor was created in 1938.
The cast of Dos amigos - 2013 includes: Jorge Monje as Manu
The cast of Los dos amigos - 2005 includes: Federico Vuegen
The cast of Dos amigos de cuidado - 1994 includes: Humberto Herrera
no they have some there
Tiene dos amigos.
The cast of Los dos amigos - 1980 includes: Sandra Duarte Regino Herrera Martina Mena Eduardo Noriega Guadalupe Tijerina
Yo tengo dos mejores amigos
Sois mis dos mejores amigos.
The cast of Dos amigos y un amor - 1938 includes: Francisco Bastardi Francisco Canaro Juan Carlos Thorry Norma Castillo Pepe Iglesias Antonio Maida
If the 'azul' in any way refers to the 'amigos', then it's 'azules,' not azul. This means "The two blue friends." (This assumes that 'dis' is a misspelling of 'dos.')