> I also discovered that some users were using a computer for ten years without even understanding the minimize function for a window ! The only way to switch between a web page and a word processor was to close one and then opening the other. It was seen as normal !

Makes me appreciate browsers tabs as window management even more. So much more intuitive. You see all open tabs in the tab bar, and you see the focused tab. You can close tabs, but there's no need to "minimize" a tab, just pick another one.