gwt-comet newbie questions

[dhoffer]

I'm looking for a high performance Bayeux/comet solution for GWT and
found gwt-comet on the web. If I understand it correctly this
implementation is one-directional, that is it uses a comet connection
to send data from the server to the client but the reverse is not
true; to send data from the client to the server standard GWT RPC is
used, is this correct? (I'm looking at the chat example.) Is there a
way to make the comet connection bi-directional?

Has anyone compared this solution to CometD?

Thanks,
-Dave