If you check out my DVD Profile online the collection ID's in my DVD Profile directly correspond with the slot numbers my DVD changers.

LP's DVD Profile:
[Link: invelos.com]

This is how I keep track of what DVD disc is in what changer slot. I did manually enter everything into my Pronto configuration file however, but having the DVD Profiler database makes things much easier. Once you get the initial work done adding new titles to your Pronto configuration file is a cakewalk.

-Lowpro