Remote File Sharing
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The Remote File System (RFS) was a file access protocol developed by AT&T in the 1980s. It was first delivered with UNIX System V Release 3. Compared to NFS it was superior on purely logical grounds, a true network file system which preserved UNIX semantics across the network. To give transparent access to files files, whether remote or local, requires storing state about the files that keep track of how many times a file has been opened, if any process has locked the file, etc.