The various ways that filenames and file contents can be linked together:

<ul>
<li><a href="http://en.wikipedia.org/wiki/Hard_link">hard link</a>
<li><a href="http://en.wikipedia.org/wiki/Symbolic_link">symlink</a>
<li>NTFS
    <ul>
    <li><a href="http://en.wikipedia.org/wiki/NTFS_reparse_point">reparse point</a>
        <ul>
        <li><a href="http://en.wikipedia.org/wiki/NTFS_junction_point">junction point</a>
        </ul>
    <li><a href="http://en.wikipedia.org/wiki/NTFS_symbolic_link">symbolic link</a>
    </ul>
</ul>