I use lightspeed for trading, I am just starting out. I was looking at a stock I traded earlier in the day, at the time there were only 2 limit orders on LVL II. One was about 10x more than the closing price and the other was at .01. My question is what if I accidently hit buy or sell(market of course). I would be in debt instantly, many times more than my current balance. Does lightspeed have something to prevent this from happening? I tried getting some YHOO right after that, but it said markets were closed, this was at 5:55 (I thought after-market was open till 630?). Maybe this was the reason there were only 2 "funny" bids for the stock I was looking at. Its just a scary thought that something like that could happen. I would be ruined. Is this possible, has it happened before to anyone? Thanks guys!