Short for '''Network File System''', but there are others.  Invented at Sun.  Supports a large fraction of UNIX filesystem semantics (larger than the other networked FSes) but definitely not complete.
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'''Tcl and NFS'''

One issue, at least up until 8.5a1, is that a fair number of tests in the core test suite fail when run in an NFS-mounted directory.  This is because of the fact that NFS only supports a subset of the classic semantics.

[[Other issues?]]