启用与使用者介面互动的背景工作，透过使用者介面执行绪上引发的事件来沟通。
Enables background tasks that interact with the user interface, communicating via events raised on the user-interface thread.
有图形介面的处理序在执行时，其讯息迴圈是处于等候状态。
When a process with a graphical interface is executing, its message loop is in a wait state.
侦错具有使用者介面的多执行绪应用程序可能会特别地困难。
Debugging a multithreaded application that has a user interface can be especially difficult.
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