....you can trade twice a day. So if you think you've made a mistake at the close of one day, you can reverse course in the morning, but only after the first hour. With all the trades we are making with TMG, it is nice to avoid commissions.
I called Rydex.....you can place a trade in the a.m. and also make a new trade in the p.m. but, only directly through Rydex and not through a brokerage.