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<a id="control-spec.txt-1"></a>
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# Protocol outline
TC is a bidirectional message-based protocol. It assumes an underlying
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Servers respond to messages in the order messages are received.
<a id="control-spec.txt-1.1"></a>
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## Forward-compatibility
This is an evolving protocol; new client and server behavior will be
@@ -67,4 +69,3 @@ elements in these places. There are two ways that we do this:
must tolerate unexpected values. The only exception would be if there
were an explicit statement that no future values will ever be added.)
```
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