When a client application (e.g. iC Navigator) is opened from an Application Server, it reads the current access control settings from the LDAP service on its Application Server, and keeps those settings in a local cache. Subsequent changes made to the LDAP settings (made, for example, by an administrator at another location) are only periodically sent to the client application. Refreshing the cache causes the client application to re-read the settings immediately from its LDAP server.