Question: The Toronto PET Users Group uses the GEOS environment, what year was GEOS released?

Context articles: GeoPublish
Jim Butterfield
GEOS (8-bit operating system)
Doris Day Animal League
APUG
Free Software Users Group, Thiruvananthapuram
Pretoria Wireless Users Group
Deutschsprachige Anwendervereinigung TeX
Toronto PET Users Group
Serchhip Thalai Pawl

geoPublish was a desktop publishing program designed by Berkeley Softworks for the GEOS environment.
Frank James Butterfield (14 February 1936 – 29 June 2007) was a Toronto-based computer programmer, author, and television personality famous for his work with early microcomputers.
 He is particularly noted for associations with Commodore Business Machines and the Toronto PET Users Group, for many books and articles on machine language programming, and for educational videos and TV programs.
GEOS ("Graphic Environment Operating System") is a discontinued operating system from Berkeley Softworks (later GeoWorks).
 Originally designed for the Commodore 64 and released in 1986, it provides a graphical user interface for this popular 8-bit computer.
 GEOS closely resembles early versions of the classic Mac OS and includes a graphical word processor (geoWrite) and paint program (geoPaint).
The Doris Day Animal League is an animal advocacy group based in Washington D.C. It established the annual observance Spay Day USA in 1994, which the group uses to bring attention to the pet overpopulation problem in the United States.
 On September 1, 2006, the organization merged with the Humane Society of the United States.
APUG is the Analog Photography Users Group, a website and internet forum for an international group of photographers who use analog photography.
 The website was founded in September 2002, and has attracted approximately 60,000 members, including paying subscribers.
 The group's website is maintained through users' donations, subscriptions, advertising revenue as well as corporate sponsorship.
The origins of the Free software community in Thiruvananthapuram can be traced back to the group of TeX users around the University of Kerala in early 1980s.
 The community then later named themselves Thiruvananthapuram LUG (Indian Linux Users Group), GNU/Linux Users Group, Thiruvananthapuram and then ultimately Free Software Users Group, Thiruvananthapuram.
 The community has worked with the government in helping with key Free software initiatives in the government and also in promoting and supporting Free software among the general public.
 The community has also been instrumental in creating an IT policy favorable to Free software in the state of Kerala.
Pretoria Wireless Users Group is a South African wireless users group.
 It is non-profit community organisation providing a Wireless community network in Pretoria, the capital of South Africa.
Deutschsprachige Anwendervereinigung TeX e. V., or "DANTE e. V.", is the German-language TeX users group.
 With about 2000 members, it is the largest TeX users group worldwide.
The Toronto PET Users Group is one of the world's oldest extant computer user groups, and was among the very largest.
 The non-profit group is based in Toronto but has an international membership.
 It supports nearly all Commodore computers, including the PET, VIC-20, C64, C128, Plus/4, C16, C65, and Amiga, including the COMAL, CP/M and GEOS environments.
 TPUG is noted for its ties with Commodore Canada, its extensive and widely distributed software library, and its association with prominent computing pioneers such as Jim Butterfield, Brad Templeton, Karl Hildon, and Steve Punter.
Serchhip Thalai Pawl (English: Serchhip Youth Club) is an Indian not-for-profit non-governmental organisation involved in charitable activities in and around Serchhip Town and Serchhip district in the state of Mizoram in India.
 It was founded in 2010 by a group of Social-networking sites users as the Serchhip Facebook Users Group.
 The main aims and objects of the organisation is to provide better social, legal and medical services and facilities to economically backward and socially marginalised people irrespective of their tribe, caste or belief.
 They also involved in the capacity building of youth and voluntarism.