[Exim] LDAP configuration

Please don't tar and feather me for this off topic posting...

...but here are the people that might know about this topic
and could point me out some sources of information.
Unfortunately openldap doens't come with such a good manual
as exim ;-)

I'd like to use it in our intranet especially for netscape's
roaming access profiles. How for e.g. does authentification work?

Not to bother people who wanna talk about exim - please mail ;-)

Thx
--
Torsten