The relay mechanism, through the new internal Relay operation, allows
one external client to relay an operation to another external client,
and get the response back.
This can currently only be used by Creator clients. It's main use is for
mind introspection.
These ops are more canonical than trying to fudge it with the
undocumented and unclear "thought" operation.
The "Commune" op is used when asking an entity about its thoughts, while
the "Think" op is used when sending new thoughts.
