这种伪异步技术是通过接口回调（interface callback）的方法来实现的，它基于两项关键的COM技术: 连接点（Connection point）技术和COM多线程（Multithread）技术。
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这是一个对某些物品下订单的服务的简单版本，其中服务是异步的，通过一个回调接口通知客户端进度信息。
This is a simple version of a service for placing an order for some widgets, where the service is asynchronous and the client is informed of progress via a callback interface.
这是通过支持回调接口的概念实现的。
This is accomplished by supporting the notion of a callback interface.
通知事件通过回调型显式接口以及与之对应的代理和调用程序对象，与观察器进行通信。
Notification events were communicated to observers with call-back explicit interfaces and their respective proxy and invoker objects.
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