Remote Reference Layer RRL <protocol> (RRL) Part of {Java}'s {Remote Method Invocation} protocol. RRL exists in both the RMI {client} and {server}. It is used by the {stub} or {skeleton} {protocol layer} and uses the {transport layer}. RRL is reponsible for transport-independent functioning of RMI, such as {connection management} or {unicast}/{multicast} {object invocation}. [Specification URL?] (1997-12-03)