The Multiuser DOS Federation (MDOS) was an industry alliance to promote the growth and acceptance of multi-user DOS-based solutions on 286, 386 and 486 computers. It was formed in July 1990. The idea was to reduce costs by allowing workgroups to run DOS applications from a shared PC while working on terminals or workstations.
On 18 February 1991, several members of the Multiuser DOS Federation issued a press release regarding their intentions to support DPMI (mostly DPMI 1.0) in their products including Alloy Computer Products Inc. (PC-PLUS), Bluebird Systems, Inc. (SuperDOS), Concurrent Controls, Inc. (CCI Multiuser DOS), Digital Research, Inc. (DR Multiuser DOS), S&H Computer Systems, Inc. (TSX-32), StarPath Systems, Inc. (Vmos/3), The Software Link (PC-MOS/386), THEOS Software Corporation (THEOS), Intelligent Graphics Corporation (VM/386).