Exactly. And the 90 day restriction you can still trade, but when selling a stock you can't use the profits right away, you have to wait three days until the funds clear (where before you were allowed to buy another stock immediately *but have to hold that position for three days*)
Scott Trade may let you have a margin account which eliminates that problem. But they also limit how many times you can buy and sell the same stock on the same day in a month ( I think it is a 3 times per month restriction)