Saving Custom Data in .duf
I have a situation where I need to save custom data into the .duf file with the scene. I can get an object to save, but I cannot seem to get any of the callbacks to execute to allow me to put my data into the "extra" sections. Are there any examples on saving data that are completely foreign to DS, but are critical for the plugin, to save in the scene's .duf?
EDIT: What would be more useful is a flow diagram on what is happening on .duf save/load and when/why, in the process, specific routines are called.
Also, what caveats should I watch for when (if) I can save the data, for reading it back out?