Thanks Alan. I'll have to check the security type when I get home. It does show what devices are connected and how (wi-fi vs. directly plugged in) and I recognized all except one, and I assume the one I didn't recognize that showed directly plugged in was the router itself.
Hmm, I wonder if there are any historical reports available. I have the dates and times of the downloads. I wonder if I could go back and see how many devices were hooked up at those times.
Not a big deal, as I assume the password change will protect us for a while, but it's a new and interesting situation to me.