# Gavin Andresen
# 2011-01-20 02:57:45
# https://bitcointalk.org/index.php?topic=589.msg39621#msg39621

Run one instance normally.  It'll listen for incoming bitcoin network connections on port 8333, rpc connections on port 8332, and connect to other nodes. @p{par}

Run the other instance with a different -datadir, and a bitcoin.conf like this: @p{brk}
nolisten=1 @p{brk}
rpcport=7332  (or whatever you like) @p{brk}
noirc=1 @p{brk}
connect=127.0.0.1:8333 @p{par}

You'll need to be running the latest source code from github for the nolisten option. @p{par}

The noirc and connect settings aren't strictly necessary; leave them out and the second instance will make 8 outgoing connections to other bitcoin nodes.  You'll save a little network bandwidth if the nolisten instance only connects to the other node.