During the configuration of the User Application we're asked for the "Root
Container DN" and the "User & Group DN". I can't remember exactly what the
purpose of each of these settings are but one of them is used as a search
base for validating authentication.

In most LDAP applications and searches I find the need to use a blank search
base in order to let the application search from the root of the tree down
through all sub-containers. This is essential where you have a tree that has
multiple O's in the root, all containing users that need to authenticate to
the application.

What parameters do I use for the User Application to allow it to search for
users in multiple O's or preferably from the root of the tree?