In order to achieve acceptable pelformance in enhanced DBMS different kinds of parallelism have to be enabled by appropriate implementation capabilities. The Remote Cooperation System (RCS) offers these capabilities. lt is the basic communication system of our enhanced DBMS called PRIMA. In this paper we present different implementations for RCS and an analysis of their pelformance behavior. In order to get a better assessment of these implementations, we compare our measurements to those obtained with conventional remote procedure call facilities offered by operating systems. The results demonstrate that RCS is suitable for supporting parallel query execution.