The SST Communications components provide efficient communications in a transport-independent way. SST abstracts the notion of a message to cover the conventional collection-of-bytes definition as well as arbitrary user-specified objects or memory. For example, when interfacing to a C transport which maintains its own transport data structures, you might maintain pointers to those structures as part of your message.

Other concepts introduced by the communications components are endpoints, URLs, configurations, and transports.

The classes and methods related to communications are contained in the SstCommunications application and transport-related applications such as SstTcpCommunications.