Editing Unix System Laboratories (section)

==Other software work==
{{main|Tuxedo (software)}}
Another unit within USL, called the Open Solutions Software business unit and headed by  Joel A. Appelbaum, was responsible for other system software that in some way worked in conjunction with Unix.<ref name="pr-rosetta"/>

The [[Tuxedo (software)|Tuxedo transaction processing middleware]] had also been transferred from elsewhere in AT&T to USL.  It had originated as the [[Loop maintenance operations system|Loop Maintenance Operations System]] (LMOS) followed by the Unix Transaction System (UNITS) and was used for projects internally within AT&T.  It was then renamed by USL and, as Release 4.0 of what was now called Tuxedo, in 1989 was offered for the first time as a commercial product.<ref>{{cite book | url=https://archive.org/details/zdanh_test_031_tuxedosystemsoft00juan| url-access=registration<!-- https://books.google.com/books?id=Of6BdiZu9lUC&pg=PT27--> | first1=Juan M. | last1=Andrade | first2=Mark T. | last2=Carges | first3=Terence J. | last3=Dwyer | first4= Stephen D. | last4=Felts | title=The TUXEDO System: Software for Constructing and Managing Distributed Business Applications | publisher=Addison-Wesley | location=Reading, Massachusetts | year=1996 | pages=xxxiii–xxxvi| isbn=9780201634938 }}</ref>

USL also developed and marketed the OSI Communications Platform, which was an implementation of the [[OSI model|OSI protocols]] for Unix-based networking.<ref name="nw-knowhow">{{cite news | url=https://books.google.com/books?id=cBAEAAAAMBAJ&pg=PA9 | title=Novell buys into AT&T unit to gain Unix net know-how | first=Ellen | last=Messmer | newspaper=Network World | date=April 15, 1991 | page=9 | access-date=March 28, 2021 | archive-date=March 28, 2021 | archive-url=https://web.archive.org/web/20210328062602/https://books.google.com/books?id=cBAEAAAAMBAJ&pg=PA9 | url-status=live }}</ref>