Editing Virtual DOS machine (section)

=={{anchor|MVDM}}OS/2 MVDM==
Multiple virtual DOS machines (MVDM) are used in [[OS/2 2.0]] and later since 1992.<ref name="Schulman_1994_Undocumented-DOS"/><ref name="Deitel_1992"/> OS/2 MVDMs are considerably more powerful than [[#NTVDM|NTVDM]]. For example, block devices are supported, and various DOS versions can be booted into an OS/2 MVDM.<ref name="IBM_WorkplaceShell"/> While the OS/2 1.x DOS box was based on DOS 3.0, OS/2 2.x MVDMs emulate DOS 5.0.<ref name="Schulman_1994_Undocumented-DOS"/>

Seamless integration of [[Windows 3.1x|Windows 3.1]] and later [[Win32s]] applications in OS/2 is a concept looking similar on surface<!-- but using considerably different technology --> to the seamless integration of [[XP Mode]] based on [[Windows Virtual PC]] in [[Windows 7]]. A redirector in a "guest" VDM or NTVDM allows access on the disks of the OS/2 or NT "host". Applications in a "guest" can use [[named pipes]] for communication with their "host".<ref name="Microsoft_490895"/>

Due to a technical limitation, DOS and 16-bit Windows applications under OS/2 were unable to see more than 2&nbsp;GB of hard drive space;<ref name="Arca_2020_1"/> this was fixed in [[ArcaOS]] 5.0.4.<ref name="Arca_2020_2"/>