The window manager services APIs manage multiple windows, support I/O to several active windows, and allow switching between windows. Much of the work of the window manager services is performed implicitly through the window builder routines.
Windows are managed on an activation-group basis. That is, all windows that were started within a given activation group will be managed as a unit. You can only switch to or end a window that was started within the current activation group. If windows need to be redrawn, only those windows within the current activation group will be redrawn. A window can be created in one activation group and started in another group. The activation group in which the window was started will be the group to manage the window.
The window manager services APIs are:
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