calling non-GWT RPC Server

Hello,
is it possible to have a GWT application make RPC calls to a RPC
server that has been developed independent from GWT?

If yes, can I still use GWT's RemoteService and RemoteServiceServlet
or do I have to implement RPC communication from scratch?

Can I find an example somewhere, how to communicate between a GWT
client and a non-GWT RPC server?

Thanks
Georg

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