multiple LDAP Directory - question from a newbie

[Raj Balasubramanian <r0x61j@comcast.net>]

Hi
I am new to the mailing list and to openLDAP. Here is the question I have-
If I have multiple LDAP Directories that I want to search for entries, 
is there a single LDAP Directory or service I can configure to cascade 
these multiple LDAP Directories. So all I need to do is query this 
central LDAP Dir for info and this will proxy the request and query the 
various different LDAP dirs (its configured to go against)??
I am not looking for referals to be passed to the client, I want the 
server to carry out the query...

		  |		|<-----LDAP---->| LDAP DIR 1|
user<----LDAP---->|LDAP DIR A	|<-----LDAP---->| LDAP DIR 2|
		  |		|<-----LDAP---->| LDAP DIR 3|

I know with Domino LDAP service this feature is available with a 
functionality called Directory Assistance. But not everyone has Domino 
deployed...
Any assistance would be appreciated.
Thanks
raj