Search Google for "indesign in-tools power headers plug-in" without quotes.
Thank you! This is exactly what I am looking for.
Hmmmm, I maybe spoke too soon. Not sure if there are bugs with CS6 or what, but the In-Tools Power Headers is behaving strangely. I posted on their forums about my problems, but no responses yet. Anyone out there with any other ideas?
So, we need to buy separate plug-ins to get InDesign to work properly? >.<
The running header functionality described by the OP here is not "a very specific requirement". It is the normal way of creating running headers (the term "running" comes from this). That InDesign can only pull up the first occurence on a page is simply to lousy, and makes it useless for a lot of publications.
This behavior has been the standard in publishing for, well, forever! Look at any dictionary or encyclopedia. InDesign handles running headers exactly as it should. What your author/publisher want is simply nonstandard.
We don't need another debate on this. I'm locking it.