Larry ... do you mean trading system as in computer system? ... I trade on-line with Man Financial ... I use Genesis for data and charts (and it is only adequate, in my view) ...
... I use Larry Williams system of set-ups, but use a range of ideas for entries ... I described some of LW's system earlier today ... but it is 'grounded' in following the commercials as well as public opinion ... the ADX and stochastics, and their relative positions to each other are also important ... many other lesser things ...
... I do not do any software system back-testing ... I do rely on my widespread readings of macroeconomics to determine long-term trends, and that has worked very well ...