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Tunnelling solutions commonly used outside the Tcl world include SSH port forwarding, Zebedee, Stunnel [L1 ], ...
See SSL Tunnel for a script that tunnels through web proxy servers using tls.
SockSpy can also be used for tunnelling. For example, I've used it to access my university's news feed machine from a remote site (the news feed machine would only accept local connections). KPV
See also