How AsyncCallback works? - RPC services

Hi,

Not sure how the AsyncCallback works in GWT. Could somebody share
please?

1) Will it create a thread and polls the server ?
or
2) Will servers register's client IP and when result is available
makes a fresh TCP/IP connection to client
and calls client.

Within this call back, will server calls a method on skeleton
(server side stubs) for remote call ?
or
It just makes a tcp call and client handles calling the Async
method ?

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