Multiple Timeframes

Rules and values can all use the same interval, e.g. Hourly bars. Like this:

• Rule 1 does its calculations with EURUSD/Hourly/FXCM
• Rule 2 does its calculations with EURUSD/Hourly/FXCM
• Rule 3 does its calculations with EURUSD/Hourly/FXCM

Or they can all use different intervals, e.g. some use 5-Minute bars, others 20-Minute bars, and others Hourly. Like this:

• Rule 1 does its calculations with EURUSD/5-Minute/FXCM
• Rule 2 does its calculations with EURUSD/20-Minute/FXCM
• Rule 3 does its calculations with EURUSD/Hourly/FXCM

In fact ATM doesn't really care where the prices came from. This is also possible:

• Rule 1 does its calculations with EURUSD/5-Minute/FXCM
• Rule 2 does its calculations with EURUSD/20-Minute/Oanda
• Rule 3 does its calculations with EURUSD/Hourly/Gain Capital

And finally, not all rules need to check the same symbol:

• Rule 1 does its calculations with EURUSD/5-Minute/FXCM
• Rule 2 does its calculations with USDNZD/20-Minute/Oanda
• Rule 3 does its calculations with GBPJPY/Hourly/Gain Capital

So you can make trading decisions in one symbol based on what a different symbol is doing. In fact in this last scenario you can do the actual trading in yet another symbol if you like - it doesn't have be any of EURUSD, USDNZD, nor GBPJPY.