It is a simple no-nonsense program, containing a sophisticated mathematical calculation, which has been successfully used by a few top traders. Select tickers in capitals, separated by commas, including any that may influence the price you wish to analyze. Current two years of data will be downloaded free over the internet (and GoldenGem can read ascii files such as the sp500hst.txt which is also available free each day). Set a number of days on the slider. In each iteration three traces cross the screen. The red trace is the selected ticker. The blue trace is the same data advanced by the chosen number of days. The green trace combines all loaded data to learn to match the blue trace, advanced by the number of days selected on the slider. Adjust the sensitivity, high at the beginning and then lower. If the fit is good, it is important to set the sensitivity to zero and verify this is still the case, because of the possibility of feed-through. Further information can be found at http://www.goldengem.co.uk