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Please do not invest in software that uses historical price trends. True, one way to determine the movement of a stock is to look at historical price, but not the only way. Furthermore, if you are dead set on swing trading, research a stock on finance.yahoo.com. It will provide you with a chart up to 5 years, and you can save your money on the software. Then take a month or two and simulate the trades you would have made on an excel spread sheet, you can monitor the stock, see if the strategy is effective, and avoid losing your money. Good luck.
metastock, esignal, tcnet, and tradestation are all good software programs.
try http://www.prophet.net
stockcharts.com
and barchart.com
those are good free net charting services