应用程序打开或关闭文件时，需要由操作

系统来决定如何访问包含了指定文件内容的一个设备。找到设备后， I / O请求会被转发给一个本地设备驱动程序。通过网络来访问一个设备也同样。然而， I / O请求必须通过网络转发给对应的远程设备。我们将其称为“I / O重定向”（I/O Redirection）-Application to open or close a document, required by the operating system to decide how to access the content of the document contains a specified device. To find equipment, I/O request will be forwarded to a local device driver. Through the network to access a device also. However, I/O requests must be sent through the network to forward the corresponding remote device. We will call " I/O Redirection"　(I/O Redirection)