Real-time stocks example

Hi!

I would like to make an example "stocks" running in real time. Do you have any idea how this could be done? I'm interested in top down ideas.

As far as I understand we can get data from yahoo finance all the time if we access it every few seconds. We also need to think about how to redraw the candlesticks each time. Also we need some kind of storage, otherwise all data might not fit in.

In general, I would be glad to get any ideas for an example and articles, based on which I could make the example realtime.