Re-read the part you omitted with [...]. Doesn't it say something
about "only available"?
It does, but it seems you're trying hard to avoid telling the user "you
should use 'current'", where 'current' is the only reasonable option for
this user. I still don't understand what problem you're trying to solve.
--
Matthieu Moy
http://www-verimag.imag.fr/~moy/