> My 4yo daughter can set the foreground and background colors in emacs

You, sir, win!

More seriously, has she learnt how to read and type? Or does she like playing with letters on the screen?

She types by hunt and peck. The was a while where I'd have to help her find the "f" key, etc., but that's pretty rare now. She has a notebook with some words spelled out in it (names mostly: "Cinderella," "Ariel," "Mommy,"...) and she'll type them in and read them, and I'll usually write her some sort of message on the screen when we set it up.

We started doing this last fall IIRC and she'd either play with letters or we'd use commands and type words in together. There was a lot of filling the screen with "*" to make a snowstorm. She's somewhat more independent now but there's still a lot of running back and forth and consultation.

She likes Webdings a lot too.

Forgot to mention the most important part: I let her pick the font and we set the point size to 72 (the max). Large letters help.

awesome. :) Thanks for sharing!