Being ignited with a sudden interest about the inception of computers i got to know one interesting thing about windows. I can clearly remember my I.C.T teacher telling me windows was the first to start producing OS with GUI’s. Well, now i know that is false. If you are interested, there is information here that could help you clearify this idea that has gained an unwarranted seat in our heads perpetuated by (w..d..s).

http://en.wikipedia.org/wiki/History_of_the_graphical_user_interface