Macworld:

One of the cool things about the new fourth-generation Apple TV is that it supports HDMI-CEC, so that you can control your TV or your speaker system using the remote control that came in the box along with it, automatically switching everything to the right input, controlling volume, and turning everything off at once when you’re done.

But like the fourth-gen Apple TV, the second- and third-gen models (so, basically, every “black puck” Apple TV) have another, often overlooked trick up their utterly non-existent sleeves: they can be controlled from any other remote control. (Caveat: it needs to be a remote that issues its commands over infrared, not RF, but since that accounts for the overwhelming majority of remotes, we’re pretty confident saying “any.”)

Doing this won’t mean your TV automatically switches to the correct input, say, and of course it wouldn’t allow you to use Siri on the new Apple TV, since the third-party remote you’ll be using wouldn’t have a mic or Siri support. But what it does mean is that you can either deliberately or accidentally loose the little white or silver remote that you had been using with your Apple TV and just use the big remote that came with your TV.

Really useful tip for those of us who want to use a single universal remote to control all of our TV-connected bits and bobs.