If you are integrating eXo Platform with LDAP (for example, MSAD or OpenLDAP) and you have multiple directories (different servers with different administrators), you can do it.
This is because that the PicketLink IDM framework is able to work with many LDAP connections and stores.
If you don't know how to change the navigation link of the Help portlet on the top navigation bar,
simply follow the newly added part named Changing configuration of the top navigation bar in this section.
To make the On-site notification (new feature of 4.2) work properly in a cluster environment, there are some extra steps to configure CometD Oort.
Check out the link above to see updates you need when setting up eXo Platform cluster.