Output is another story. If the name, referenced on the -H help line, is a directory, within that directory there can be several files which will be displayed. This will start up cantata , with the demo predefined for you. The setup was saved in a file called demo.workspace.Z . They represent a Quit, Edit and Run functionality.
Parameters can use the program default by unsetting the option button.
It normally comes as a filled black square, meaning the entered value will be the one used by the program. Any previous connections would then be broken. Intermediate results are typically lost, after you exit from Khoros, though can always be stored into a file at demand. Click the mouse while pointing at a dataflow line, and you'll see what they mean with this. Ne sure all required inputs and outputs are connected, otherwise the flow will be interrupted.