Thanks Raym.
I'm using a USBUIRT receiver with the remote I got with my TV card, no third party software. Am about to purchase a Harmony though (need to increase WAF) and don't want buttons / functions being wasted if I can help it. It's far easier to teach what a button does than explain why one does nothing :-)
I hadn't thought of the Next / Previous Track thing - seems kind of obvious now. I do have these programmed already, so may be time for me to do some reprogramming.
Thanks heaps.