Registry
Storage of information about sessions and clients
Must be installed on the host where JSDT servers run
Uses default port to communicate with JSDT applications
Can be started separately or from the JSDT server
- command line
- RegistryFactory
Various implementations
- socket - TCP/IP sockets
- lrmp - Light Weight Reliable Multicast Package (LRMP)
- rmi - Remote Method Invocation (RMI)