一台路由器或者主机可以通过发送请求命令(request command)来要求另一台路由器进行路由。接受请求的路由器将返回响应命令(response command)给请求方。
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设备请求命令失败。
当用户请求命令（应用功能）时，序列通过与用户接口对象相互作用来被执行。
The sequence starts when a user requests a command (an application function) to be executed by interacting with a user interface object, in this case the main form of the application.
DDR2内存不能直接识别主端口的请求命令，必须经由内存控制器处理后才能执行。
The controller is used to translate requests coming from host port because DDR2 SDRAM could not execute these com- mands directly.
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