You can put any amount (within reason) of filenames on the command-line when starting the application. If there are filenames on the commandline all listeners in the default session will be removed and new ones will be created as described below.
A file name with the .l4n extension will remove the default session and start a new according to the settings in the file. The configuration window will not be shown on startup. Make sure this is the first argument on the command line if you intend to add more arguments.
A folder name will create a folder listener for that folder.
A file name with the .exe extension will start the application with a predefined StdOut listener.
Any other file name will create a file listener for that file.