remapping in launch files

Hi guys, I have created a launch file that launches the camera1394 driver and displays the color image using the image_proc and image_view packages. I am also trying to launch the dynamic_reconfigure node and connect it to the camera1394 node, however I am having a problem with the remapping, here is what I am trying to do in my launch file: I am not sure where to get the XXX name from? Could someone please tell me where I can find the names of the inputs/outputs of a node(in general)from? Thanks and regards, Khalid