it was less flexible in this regard than a network of individual PCs, and as the prices of these fell, it became less and less competitive, although it still offered benefits in terms of management and lower total cost of ownership. As a multi-user operating system its price was higher than a single-user system, of course, and it required special device drivers, unlike single-user multitasking DOS add-ons such as Quarterdeck's DESQview. Unlike MP/M, it never became popular for single-user but multitasking use. When Novell acquired Digital Research in 1991 and abandoned Multiuser DOS in 1992, the three Master VARs DataPac Australasia, Concurrent Controls and Intelligent Micro Software were allowed to license the source code of the system to take over and continue independent development of their derivations in 1994. Known versions include: DR Multiuser DOS 5.00 (1991), 5.01 Novell DR Multiuser DOS 5.10 (1992-04-13), 5.11 Novell DR Multiuser DOS 5.13 (BDOS 6.6, 1992) All versions of Digital Research and Novell DR Multiuser DOS reported themselves as "IBM PC DOS" version 3.31. Adaptations DataPac Australasia Known versions by DataPac Australasia Pty Limited include: Datapac Multiuser DOS 5.0 Datapac Multiuser DOS 5.1 (BDOS 6.6) Datapac System Manager 7.0 (1996-08-22) In 1997, Datapac was bought by Citrix Systems, Inc., and System Manager was abandoned soon after. In 2002 the Sydney-based unit was spun out into Citrix' Advanced Products Group. Concurrent Controls Known CCI Multiuser DOS versions by Concurrent Controls, Inc. (CCI) include: CCI Multiuser DOS 7.00 CCI Multiuser DOS 7.10 CCI Multiuser DOS 7.21 CCI Multiuser DOS 7.22 R1 (September 1996), R2 (1996), R3 (1997), R4 GOLD/PLUS/LITE (BDOS 6.6, 1997-02-10), R5 GOLD (1997), R6 GOLD (1997), R7 GOLD (June 1998), R8 GOLD, R9 GOLD, R10 GOLD, R11 GOLD (2000-09-25), R12 GOLD (2002-05-15), R13 GOLD (2002-07-15), R14 GOLD (2002-09-13), R15 GOLD, R16 GOLD (2003-10-10), R17 GOLD (2004-02-09), R18 GOLD (2005-04-21) All versions of CCI Multiuser DOS report themselves as "IBM PC DOS" version 3.31. Similar to SETVER under DOS, this can be changed using the Multiuser DOS utility. In 1999, CCI changed its name to Applica, Inc. In 2002 Applica Technology became Aplycon Technologies, Inc. Intelligent Micro Software, Itera and Integrated Solutions DOS 386 Professional IMS Multiuser DOS Known adaptations of IMS Multiuser DOS include: IMS Multiuser DOS Enhanced Release 5.1 (1992) IMS Multiuser DOS 5.11 IMS Multiuser DOS 5.14 IMS Multiuser DOS 7.0 IMS Multiuser DOS 7.1 (BDOS 6.7, 1994) All versions of