~/.ipython/profile_spockdoor/ipython_config.pykeeps track of the selection. From then on, every session that is invoked by the simple command 'spock' uses this profile with the corresponding Door.
To start a spock session which communicates with a different Door use the command:
$ spock --profile=secondDoor
A new profile is created and you are prompted again for a Door name. In the future you may use one of these commands without further questions:
$ spock $ spock --profile=secondDoor