Nora's learning to talk, and along with that comes some sign language (showing me by grabbing her diaper in front that she's gone potty) and also outright telling me she's gone "poppy".
After reading in my Parenting For Dummies book (I love that book for straightforward questions like "when is my kid ready to start potty training?") it said to get one and start showing the kid around it, and talking about going potty, and what we do.
This week, we got a new potty in the house, and Nora mostly uses it as a step stool to get up onto our bed, but I did finally show her, with no diapers on, how to sit on the thing with the lid up, which she did, and was so very proud of herself when I cheered her on.
We're a long ways from peeing in there as far as I know, but it's begun!