make sure your dos prompt is in myfiles_collected
type: renderdl -id file1.rib file2.rib file3.rib
idisplay will open and show you the current render in progress
When rendering is done, go to iDisplay and goto File/Save All Images
All of your images will be present in idisplay so long as you used the -id command tag
there is a rib file in the files_collected folder as well. The one outside that folder only exists if you are keeping your file open in DAZ Studio. If you shut down DAZ Studio while that file is being read, 3Delight read it as an error and stop rendering.
The one it creates when you collect the files is the one you should use, and that is in the collected folder.