Source : Free On-Line Dictionary of Computing

Prospero
     
        A tool for organising {Internet} resources.  Prospero allows
        each user to organise the contents of remote file servers into
        his own virtual file system with his own hierarchical name
        space consisting of links to remote objects.  Remote indexing
        services are made available by treating the results as a
        virtual directory.  A "union link" allows the contents of the
        link's target directory to appear as part of the directory
        containing the link.  Arbitrary filters can be associated with
        links to modify the representation of the target directory as
        desired.  Prospero directories can be shared between users.
        The Prospero protocol is used for communication between
        clients and servers in the archie system.
     
        A prototype of Prospero has been available since December
        1990.  It interfaces with Sun {NFS}, the {Andrew File System}
        and {FTP} (with local caching) and {Archie}.  Support for
        {World-Wide Web} and {WAIS} is planned (1992).
     
        E-mail: .
        {(ftp://prospero.isi.edu/pub/prospero)}.