If the application indicates that you need to use E:, the operating system automatically redirects the I / O request to a device, which is called "Redirector). The redirector is established to a network channel to the remote computer to access the specified remote directory. Subsequently, applications can freely use some regular file system API functions, such as ReadFile, and Writefile, etc.. Although it is actually accessed through the network, the surface is not different from the access to the local file.
