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Oh, just a simple ssh-tunneling thing.. Well that is widely used, for secure pop3 connections and the like..
I thought it had something todo with a firewall only having port X open, but the proggy you wanted connected to, was expecting connection on port Y, so therefor either letting the firewall re-route any incomming connection on port X to port Y on the client, or (if the client had an external IP, but still behind the firewall) letting the client redirect connections comming on port X to its own port Y.
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