此外，这个计划可以宣布交付通知特别声音，在您的意愿。
Additionally, this program can announce the delivery notification with a special sound, at your will.
如果存在一个新通知，PresenceSession将调用相关PresenceListener的notify方法来交付通知。
If one exists, the PresenceSession calls the notify method of the associated PresenceListener to deliver the notification.
客户机代码将轮询输出队列以获得响应，或等待响应消息交付时的回调通知。
The client code would either poll the output queue for the response or wait for some kind of call-back notification when the response message has been delivered.
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