Hard links to directories: why not?

[franck boissiere]

>From article <6914 at umd5.umd.edu>, by rbn at umd5.umd.edu (Ron Natalie):
> 
> 
> And where whould you have .. point if you had multiple links to
> a directory?  Things would get pretty wierd.
> 
> -Ron

This problem doesnot seem so crucial for symbolic links. This leads to
the question what makes the problem crucial in one case and not in the
other? Another question is when is it more appropriate to use one or the
other?
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