Business Events Action selector. When this selector is executed on receipt of a message by ESB, it determines which operation from the interface will be invoked to process the message.
ESB在收到一条消息时执行这个选择器，该选择器确定从接口调用哪个操作来处理消息。
When a process with a graphical interface is executing, its message loop is in a wait state.
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.
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。
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