Stock Markets Exposed - what is a good stock trading system?

what is a good stock trading system?

Depends what you mean by "stock trading system" exactly? If you are referring technical analysis software the only one that I have used and like is MarketClub. Most of the other ones simply are not worth the money. Remember these systems are only meant to be used as tools to assist you not to actually pick your stocks for you.
Stock trading trading systems are hard because there is no magic system, most stock systems inform you on the stocks going up right now but even you can look in the paper and see what stocks are going up, it doesnt mean they will continue to go up. There is a few good websites with stock recommendations out there that tell you the good stocks to buy based on information like http://goldenbullstocks.com give them a test drive you will be impressed!
To Buy low and sell high To Sell high and buy lower As simple as that