The user interface in OS/2 introduced with Version 2.0. The Workplace Shell was extensible and application developers used Workplace Shell library functions when developing programs.
"Workplace Shell." YourDictionary, n.d. Web. 24 May 2018. <http://www.yourdictionary.com/workplace-shell>.
Workplace Shell. (n.d.). Retrieved May 24th, 2018, from http://www.yourdictionary.com/workplace-shell