Se thread
http://clearspace.openqa.org/thread/14403?tstart=0
E.g. when "auto" is checked, start Selenium Server. If not, use existing server on e.g. localhost 4444.
Must also update GUI to give information on this.
Set default port to 4444 in GUI (Selenium Server default).
Workaround for the moment is to specify IP address to local machine (not 127.0.0.1 or "localhost") in the launch configuration. Then a server will not be started.