Although asynchronous messaging is, in principle, a one-way communication, you can make it invoke some functionality in the receiving application.

尽管从理论上讲异步消息传递是单向通信，但是可以让它调用接收应用程序中的一些功能。

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XMS offers a choice of synchronous and asynchronous styles for receiving messages.

XMS为消息的接收提供了同步和异步两种选择。

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With Ajax, the server-side validation can be done through asynchronous calls and the user notified near real time (upon receiving an asynchronous response).

有了Ajax，服务器端验证可以通过异步调用实现，用户也可以得到近乎实时的通知(在收到异步响应之后)。

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