One frame per group can also be flagged as a catch-all so that all new application windows open there. The frameborder colour changes to reflect these modes.
每个组中的一个框架能被标记为总受器，这样新应用程序的窗口都在这打开。
2
Tip: If a frame has visible borders, the user can resize it by dragging the border.
如果一个框架有可视边框，那么用户可以通过拖曳边框来改变框架大小。
3
First we'll add a simple frame which is identical (except for the color) to the border we built in the previous example.