Re^4: The most useless key on my keyboard is:

[maard]

Actually Windows has such oportunity, but special equipment has to be installed :). e.g. my ATI RADEON card software can create up to 9 desktops. But it's still difficult to use it, because on switching between desktops it shuffles apps icons on taskbar. Also, when modal dialog is displayed on inactive desktop the whole system becomes dead-locked :)
That's why i'm not using it :)