For Close, Alt+F4 is proposed since users of CUA-based environments...
Not sure if this is standard, but on my box Alt+F1 through Alt+F4 are used for switching between desktops/viewports.
-ErikP.S. Frighteningly, Windows emmigrants who know Alt+F4 and don't know viewports will try using it Alt+F4 to close a window and find *all* their windows disappear. Scared me the first time.
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