域名解析的工作方式是客户端与服务器通信，并请求将某个特定地址解析到对应的部分(即从名称解析到IP地址，或从IP地址解析到名称)。
Domain name resolution works by a client contacting a server and requesting that a particular address be resolved to the corresponding part (i.e., name to IP address, or IP address to name).
这就意味着在comet流样式通信持续期间，从客户端设备到后端服务器的每个系统上都至少有一个连接处于不可用状态。
This means that during the duration of a Comet streaming style communication, at least one connection is tied up on each system from the client device to the backend server.
更重要、也是更关键的是，对于这种类型的项目而言，Exchange服务器完全不会注意到，与它通信的不是一个与Exchange兼容的客户端。
More importantly, and critically, for a project of this sort, the Exchange server is completely unaware that it is communicating with anything but another Exchange-compatible client.
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