rsync - Aug 2010 - does rsync work in lockstep? parallel could improve high latency performance

Just curious if the protocol sends a request and waits for a response,
or whether it can multiplex multiple requests on a single connection.
This could improve performance over high latency links, if a lot of
time is spent waiting for the response (i.e. when the hashes match).
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Oh, and if it buffers requests sent to its STDIN, that's fine.

To actually complete requests in parallel, you'd need a multithread or
multiprocess app, and that's complicated.

The proper term for what I'm suggesting is probably "pipelining".
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