Editing Unix System Laboratories (section)

==Chorus and Ouverture==
[[Image:High Street in Ealing.jpg|thumb|left|upright=0.9|USL Europe's offices were in Ealing, London (in the building on the right side after the road bends, as seen here in 2009)]]
In 1991, USL forged an arrangement with the French company [[Chorus Systèmes SA]] to engage in cooperative work on the [[ChorusOS|Chorus]] [[microkernel]] technology, with the idea of supporting SVR4 on a microkernel and thereby making it more scalable and better suited for parallel and distributed applications.<ref name="en-1991"/><ref name="pcw-1993"/>  As part of this, USL took a $1 million stake in Chorus Systèmes.<ref name="en-1991">{{cite news | author-last=Khermouch | author-first=Gerry | title=USL backs French firm's Microkernel | magazine=Electronic News | date=November 25, 1991 | page=13 | via=Gale General OneFile | url=https://link.gale.com/apps/doc/A11521898/ITOF?u=wikipedia&sid=ITOF&xid=50f6313d | access-date=March 28, 2021 | archive-date=March 28, 2021 | archive-url=https://web.archive.org/web/20210328062613/https://go.gale.com/ps/i.do?p=ITOF&u=wikipedia&id=GALE%7CA11521898&v=2.1&it=r&sid=ITOF&asid=50f6313d | url-status=live }}</ref>  Much of the USL Chorus work was done at the USL Europe facility in London.<ref>{{cite web | url=https://cordis.europa.eu/project/id/6603/es | title=An Industry Project to Progress Microkernel-based Open Operating Systems for the 1990s | publisher=Community Research and Development Information Service | work=Resultados de investigaciones de la UE | date=June 17, 1994 | access-date=May 21, 2020 | archive-date=November 30, 2020 | archive-url=https://web.archive.org/web/20201130232809/https://cordis.europa.eu/project/id/6603/es | url-status=live }}</ref>  By 1993 the work was still ongoing, with questions of industry standardization of interfaces arising.<ref>{{cite news | url=<!-- https://www.cbronline.com/news/chorus_systemes_takes_the_initiative_in_establishing_a_microkernel_compatibility_effort/ -->| title=Chorus Systemes takes the initiative in establishing a microkernel compatibility effort | work=Computergram International | publisher=Computer Business Review | date=June 16, 1993}}</ref>  [[Unisys]] was also part of the collaboration effort.<ref name="pcw-1993"/>  Announcements made during 1993 promised an OEM release in 1994 and a general availability release in 1995.<ref name="pcw-1993">{{cite news | author-last=Foley | author-first=Mary Jo | title=USL, Chorus outline plans for microkernel release of Unix SVR4 | magazine=PC Week | date=June 14, 1993 | page=60 | via=Gale General OneFile | url=https://link.gale.com/apps/doc/A13938479/ITOF?u=wikipedia&sid=ITOF&xid=deeb8d72 | access-date=March 28, 2021 | archive-date=March 28, 2021 | archive-url=https://web.archive.org/web/20210328062612/https://go.gale.com/ps/i.do?p=ITOF&u=wikipedia&id=GALE%7CA13938479&v=2.1&it=r&sid=ITOF&asid=deeb8d72 | url-status=live }}</ref>

This was part of the larger [[Ouverture project]], a $14 million effort that was itself part of the [[European Strategic Program on Research in Information Technology]] (ESPRIT), overseen by the [[European Commission]].<ref>{{cite news | author-last=Van Tyle | author-first=Sherry | title=PC fault-tolerant Unix-based system runs on a modular microkernel architecture | magazine=Electronic Design | date=October 15, 1992 | page=34 | via=Gale General OneFile | url=https://link.gale.com/apps/doc/A14402019/ITOF?u=wikipedia&sid=ITOF&xid=ede270b7 | access-date=March 28, 2021 | archive-date=March 28, 2021 | archive-url=https://web.archive.org/web/20210328062611/https://go.gale.com/ps/i.do?p=ITOF&u=wikipedia&id=GALE%7CA14402019&v=2.1&it=r&sid=ITOF&asid=ede270b7 | url-status=live }}</ref>  
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