referrals to foreign directory tree?

[Kiyoshi Watanabe <kiyoshi@bisd.hitachi.co.jp>]

Hi all, sorry for this newbie question if asked many times.

I am struggling to to find a way to use a referral to foreign
directory. My directory in my server starts with something like

          c=JP
           |
         -----
        |     |
       o=A   o=B
        |     |
       ...    ...

Also, I have a complete different directory tree in a server
in differnt location something like,

         c=US
          |
        -----
       |     |
    o=A_us   o=B_us
       |     |
      ...   ...

So I want to use these existing trees and hopefully search the right
person by setting the referrals.  But I do not know how.

Before thinking to a completly new directory to integrate them, I
would like to know whether I can use referrals (cross-reference?).

I do really appreciate your suggesion and advice.

Sincerely,

Kiyoshi Watanabe