I just subscribed to eSignal. And found eSignal provide so-called "continuous future". Like "ES #F" for S&P futures. My question is, if I use eSignal and trade with IB through eSignal's IB plug-In and use "ES #F" as symbol, what will I be trading when ES approaching expiration date? According to eSignal FAQ, they say they will rollover on the exchange (maybe they mean eSigna server, I guess) 8 days before expiration, that is the Thursday before expiration week. So does that mean if I trade "ES #F", then I will be trading "ES M4" starting March 11th, am I right? If that's really the case, then I don't have to change symbols every 3 month. Can anyone verify this for me? Much appreciated. By the way, if I trade IB with eSignal'?s IB plug-In, do I get extra charge for the integration?