Thanks, I know that, but that doesn't really answer my questions.

Case is that some of us have several thousand products in our accounts here and the number is constantly growing so we're working on an offline database program to automatically keep track of our products, notify us when they are being updated by scanning the account data etc.. Doing that manually is an almost impossible job. And for the program to work reliably we need to know how to reliably detect when a product has been updated. 

So if you could help out with answering these questions I'd be grateful. I'm sure someone at RR must know these things. :)

Thanks!