Here's a photo of Steve Jobs using Concurrence when he returned to Apple, in the late 90s: http://www.allaboutstevejobs.com/pics/life/5-1995-1999/08-pr...

Notice that even if he was at a keynote, selling to the world Mac OS 9 and new iMacs, he personally used a PC laptop running a version of NeXT/OpenStep and the software that was sold to Sun. They eventually hired the same developers to build Keynote.