Remote Procedure Calls
The DASF Messaging Framework enables you to do so-called Remote Procedure Calls (RPC), meaning that you call a function on your local computer and this function is then executed on a remote machine.
In the terminology of RPC, your local computer is the so-called client stub, whereas the remote computer is the so-called server stub.
Because most people never heard of RPC, we often just name the client stub client, and we call the server stub the backend module.