On Fri, 11 Apr 2003 10:09:44 BST, John Bradford said:

> A versioned file becomes openable as a directory as well, so that you
> can see the old versions.  I'm sure something like this has already
> been done, I'll have to try to search it out.

There was "Hidden Directory" support in IBM's AIX/370 (and probably the
AIX 1.2 that was i386-only), and I'm told some of the HP Apollo stuff
did similar.  Very strange, bizzare, aggrivating, and occasionally useful.