Source : Free On-Line Dictionary of Computing

Attributed File System
     
         (AtFS) The basis of the {Shape_VC} toolkit.
     
        Cooperative work within projects is supported by a status
        model controlling visibility of version objects, locking, and
        "long transactions" for synchronising concurrent updates.  The
        concept of object attributes provides a basis for storing
        management information with versions and passing this
        information between individual tools.  This mechanism is
        useful for building integrated environments from a set of
        unrelated tools.
     
        (2000-02-24)