Contemporary software design often begins with the assumption that the user interface will consist of a series of overlapping Windows, without modes, informed by a global metaphor.
当代的很多软件在开始设计时都有这样的设想，即用户界面应该由一系列层叠的窗口组成。
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By providing user_level network access interface and overlapping communication with computation, the high communication performance has been got.