This help me a lot: http://www.openldap.org/faq/data/cache/185.html
and also this:
-- ____________________________________________________ Ignacio Coupeau, Ph.D. e-mail: icoupeau@unav.es CTI, Director fax: 948 425619 University of Navarra voice: 948 425600 Pamplona, SPAIN http://www.unav.es/cti/