Brian Mastenbrook scripsit:

> As a general concept, this appears to be a renaming of "directory".  
> There are plenty of systems which allow "directories" to be accessed  
> which are the members of a zip archive, remote network shares, and  
> other virtual resources. Is there something I'm missing?

Well, it specifies several roots, and abstracts the idea of paths a bit.

> As a specific instantiation, I have a significant problem with the  
> specification of `program-vicinity'. How can an ordinary procedure  
> like `program-vicinity' return information about where its call was  
> located? 

By groveling into the implementation, determining the identity of
its caller and asking the system where the caller was loaded from.

-- 
Evolutionary psychology is the theory           John Cowan
that men are nothing but horn-dogs,             http://www.ccil.org/~cowan
and that women only want them for their money.  [email protected]
        --Susan McCarthy (adapted)

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