BitFling is a way for BitPim to run on one machine and your phone to be connected to a different machine, even across the Internet. It uses a protocol over a secure connection to ensure this is safe.
The technical details are that the BitFling protocol uses XML-RPC over an SSH connection. The SSH connection is provided by the Paramiko library. The only channel present is for BitFling. There is no shell access or port forwarding implemented or permitted.
BitPim Online Help built 17 January 2010