If you've always wanted to be a millionaire, here is your chance! Yesterday, participants commenced trading in the "CNBC Million Dollar Portfolio Challenge", a virtual trading competition. The "Million Dollar Portfolio Challenge" allows a participant to manage $1 million "CNBC Bucks," to trade stocks and currencies for a chance to win the grand prize of $1 million dollars! Registration for the "Million Dollar Portfolio Challenge" opened on August 22nd,though the competition went live yesterday, with registered users now able to trade currencies on a platform provided by FXCM.