Most of you might be aware that, in those days, the mouse used to come with a ball inside, and there were two rollers that actually guide the computer where the ball is moving, and, accordingly, where the mouse is moving.
De fleste af jer er måske klar over, at dengang, havde musen en kugle indeni, og der var to ruller der faktisk fortalte computeren hvor kuglen bevægede sig hen, og, derfor, hvor musen bevægede sig hen.