For kicks, I just looking up the Clarion page on Wikipedia.
According to the details there, Clarion "first appeared" in April 1986.
Did anyone have a 40th birthday cake for Clarion?
I didnt but background of how Topspeed came to be is interesting.
Bruce Barrington (is he still about?) part of HBO which benefited from the computerisation of medical records, and healthcare is big business in the US.
Then you have JPI (ex employees of Borland).