When I was in my first year of middle school, GA started the "moment of silence" deal. As far as I'm aware, that's all it ever was. You could pray or whatever, but to talk during it was punishable since it was disrespectful to whatever whoever was using the silence for.
It's been many moons since I've been in school, so I have no idea what they do now, but I've not heard of anything different.