The dispatcher is the front-end of the xbook server. It takes an user request for a xbook and looks it up in the registry. Using the registry entry, the dispatcher reads the xbook properties file (located using the xbook path) and reads in the mapfile for that xbook (i.e., who is authorized to view it). See Section 5.2 for more information about xbook property files. If the requester's DN is not in the mapfile, the request is denied. Otherwise, the request is dispatched to the appropriate xbook engine which will then handle the request.