特定目的的注册器是系统定义的，屏幕界面中所列出的注册器是针对AIX的。
Special purpose registers are system defined, and the registers listed in the screenshot are specific to AIX.
而最大宽度的定义系统能够检测终端显示屏幕的大小，如果大小在预先设定的范围内，它将只提供附属的页面风格。
The max-width property checks to see the overall screen size and will only append the styles if the condition is met.
一般的计算机视窗系统都会在屏幕上放置很多图标和预定义的区域。
A typical windowing system on a computer will provide a number of ICONS on the screen as well as some defined regions.
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