T6-R2 in five minutes

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The host is the application the person uses.

The client speaks the protocol inside that host.

The server offers tools, resources, or prompts.

One host can talk to more than one server.

A picture of logos is not an architecture. Name the roles.

A notes server does not know whether the host is a chat window or a voice session. It knows the request. That is the point of the split.