My friend Murray Ruggiero did a very good interview regarding inter-market relationships and system development. I think you will enjoy listening to it.
IMPORTANT: The risk of loss in trading futures, options, cash currencies and other leveraged transaction products can be substantial. Therefore only "risk capital" should be used. Futures, options, cash currencies and other
leveraged transaction products are not suitable investments for everyone. The valuation of futures, options, cash currencies and other leveraged transaction products may fluctuate and as a result clients may lose more than the amount originally invested and may also have to pay more later. Consider your financial condition before deciding to invest or trade.