How does the live, real-time typing work in Google Wave?

Question

I\'m sure Wave doesn\'t poll the server every millisecond to find out if the other user has typed something... so how can I see what the other person is typing as they type? And

Answer 1

Server Push in GWT

Server push is the Wait, Respond, Close, Re-Open paradigm:

• Wait: When the GWT code makes a call to your server for some data that you don't have yet, freeze (wait)

• Respond: Once the requested data is
  available, respond with it

• Close: Then, close the connection.

• Re-Open: Once your GWT code receives the response, immediately open up a new connection to query for the next event.