Stock Markets Exposed - Which is the best simulated stock trading account ?

Which is the best simulated stock trading account ?

I am interested in learning more about stock trading. I would like a recommendation for the best an most realistic Demo trading Program.

You can register free at this url http://www.cboe.com/tradtool/virtualtrade.aspx to try out the virtual tool It can be used for virtual options trading as well. It will also be helpful if you intend to use options as a hedging tool for your stock.