The events Tk responds to are similar, but not completely equivalent, to the set of events defined by the X11 window system.
Tk响应的事件是类似于 X11窗口系统定义的事件集，但是不完全相同。
Over a modern X11 system, none, and several disadvantages that come from tying the policy into the window server.
对于现代的X11系统来说，没有，而且还有一些源于将策略合并至窗口服务器处理所导致的不足。
The X Window System, also known as X11, is a graphical windowing system used on Unix-like systems, according to iDefense.
X Window系统又称X11，是运行于类Unix框架基础上的图形视窗系统。
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