Sorry for the delay, it was a hectic couple of days.
Thanks very much for the replies. Below is a pic of both remotes, with the old one at left.
Let me know if this helps, or if you need more-detailed shots.
The one on the left looks just like my Ortek remote. The Ortek IR receiver isn't compatible with standard MCE remotes like the one on the right. Just swap out the IR receiver when you put the new remote into service and you should be good to go.
Those two are definitely incompatible. So you must use the matching dongle that came with each remote. But as I said, you can continue to use both simultaneously if you want. I found that the one on the left would wake my PC reliably, but the one on the right would not. So I also used both for years.
The thing I like about the old Ortek (the one on the left) is the integrated mouse. If you prefer your old remote, I have a couple like new that you could have for the price of shipping if you want ($4 or so). I only use the dongles since I have universal remotes. So either you take them or my wife throws them out. PM me if interested.
for the info on these remotes, it's just what I was looking for. If there were a "thumbs up" smilie, I'd be putting it right here.
It'd be a shame to throw out perfectly good remotes, but wife is very happy with the HP model as the buttons are bigger and easier to find in the semi-darkness. Thanks for the offer, though. Hope they find a good home.