[imp] Can't get 3.0 rc2 to work at all

[Lars Hecking]

Chuck Hagenbuch writes:
> Quoting Lars Hecking <lhecking@nmrc.ucc.ie>:
> 
> >  With imp 2.2.x, above results in loading /horde/imp/index.php when
> >  requesting /webmail. With 3.0, it loads /horde/index.php and no
> >  successful authentication is possible.
> 
> You must either set IMP up to do Horde authentication 
> (horde/config/registry.php), or log in to Horde first.

 How? Just add an initial_page line to imp?

 Where is the stuff in horde/config/registry.php documented?