Editing Digital Research (section)

=== 1990 and 1991: Multiuser DOS ===
{{pic|Digital Research logo 1990.svg|Logo of Digital Research used briefly toward the end of its independent existence, from March 1990<ref>{{cite journal | last=von Simson | first=Charles | date=March 26, 1990 | url=https://books.google.com/books?id=cAmo4wSwQJ0C&pg=PP37 | title=DRI adds graphics update | journal=Computerworld | publisher=IDG Publications | volume=XXIV | issue=13 | page=37 | via=Google Books}}</ref> to 1991}}
In 1991 DR presented [[Multiuser DOS]].  Digital Research's multi-user family of operating systems was sidelined with the previous single user operative systems.{{Citation needed|date=August 2024}}

In one [[beta release]] of [[Windows 3.1]], Microsoft included hidden code (later called the [[AARD code]]) that detected DR&nbsp;DOS and displayed a cryptic error message.<ref name="Schulman_1993_AARD"/><ref name="Schulman_1994_Undocumented-DOS"/>