SSE is usually based around Remote Procedure Call (gRPC). This is a multilanguage and cross platform library that is based on defining a service, its methods, and return types.

Using gRPC, a client (software part) can connect to another machine (server) and run a method or function as if it were a local component. This enables the idea of services, so we can create distributed applications that have connections between clients and servers, and messages (data) can be distributed between them: