T6-R4 in five minutes

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A transport carries the protocol messages.

Local stdio and network transports are different trust stories.

A local process is not automatically safe, but it is a different boundary than a public port.

Confirm which transports the revision you read actually specifies.

Do not open a port in this lab.

The paper exercise uses stdio words only: the host starts a process, talks on its streams, and stops it. No address, no port.