Batch Ldap Synchronisation ?

Hi ,

in our Aris setup, users are authenticated against our enterprise ldap directory (and are created as Aris users upon their first connexion).

We would like to regularly delete accounts when users quit the company (their ldap account is deleted in that case).

In Aris user administration web page, there is a "syncrhonize with ldap" menu  on each user web page, if we click on this the Aris user is deleted if she does not exist in the ldap directory.

Is there any way to to this programmaticaly or to do this in bacth  ? I did not find any ldap syncrhonisation function in the reports API, nor any batch sync function in Aris administration pages. (there is an "import form ldap" but that would import all users from the directory, it is not what we are looking for).

What is happening to the models or objects created or modified by a user when she is deleted this way ? 

Many thanks for your answers.