"Er, they both ripped Xerox."
Bingo! Thank you Erlik - many peops forget or aren't aware of this.
Unfortunately, IIRC, Xerox didn't realize just what they had on their hands with their intro of the GUI interface.

I've often wondered what the mucky-mucks at Xerox thought when they saw the popularity of the GUI interface and realized just what they let slip through their hands....

I dare you, while there is still time, to have a magnificent obsession. --William Danforth