从本质上说，Ajax的异步特性使客户机浏览器能够向服务器发送请求或调用服务器端的方法。

Essentially, the asynchronous features provide the means for the client browser to send requests or call methods that are executed on the server side.

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IIPx服务器生成http重定向url，其中包含已编码的XML文档和签名，服务器会将此URL返回给员工桌面上的客户机浏览器。

The IIPx server generates an HTTP redirect URL containing the encoded XML document and signature, and the server returns the URL to the client browser on the employee's desktop.

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Web服务器要等待浏览器请求页面，FTP服务器要等待客户机请求文件，聊天服务器要等待聊天客户机所发出的连接。

Web servers wait for browsers to request pages, FTP servers wait for clients to request files, and chat servers wait for incoming chat client connections.

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