Posted Feb 13, 2012 2:19 UTC (Mon) by jmalcolm (guest, #8876)
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He means that it is much less convenient to work with multiple windows at once if the metaphor is assumed to be "full screen all the time". Many people find it quite functional to have multiple windows open and visible at once both for moving information via mechanisms like cut-and-paste and for moving information through the eyes of the user and out to another window via the keyboard and mouse.