This function allows the caller to provide authentication credentials to the DL module at a time other than data store creation, deletion, open, import, and export. AccessRequest defines the type of access to be associated with the caller. If the authentication credential applies to access and use of a DL module in general, then the data store handle specified in the DLDBHandle must be NULL. When the authorization credential is to applied to a specific data store, the handle for that data store must be specified in the DLDBHandle pair.