This class is what USES the MessageSender to send data back to the client.
正是这个类使用MessageSender将数据发送回客户机。
The MessageSender portlet sends a message when the user navigates to a certain host screen.
当用户进入某个主机屏幕时，MessageSender portlet发送消息。
The subject is used to execute callback on behalf of the user specified in the MessageSender initialization properties.
该对象用于代表MessageSender初始化属性中指定的用户执行回调。
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