Can Drupal manage and cross-link multilingual content?

Hello,

I have found these two pages:

http://drupal.org/node/43676
http://drupal.org/node/5253

but they don't seem to address exactly my problem.

I want to have a bilingual site where, besides having one interface
(menus, site map etc) for each language, any single article:

1) can have both an english and an italian version, or
2) full version in any of those languages, summary in the other
but, above all...

3) the two versions of each article, be they full or summaries,
are automatically (*) linked to each other. Even if they are added in
different moments.

(*) automatically means obviously "with as little manual fiddling as possible
by the editor", that is to have support from drupal to tag the two pages/nodes
as being the same content, just in two different languages.

Thanks in advance for any feedback,

Ortles