what does magic number actually do? :)
In my case the magic number needed to be different as I was using two different chart pairs thus wanted only the equity of my account to be the basis for the calculations. I found that there were conflicting issues with the EA from triggering the trade.
My understanding is that the EA and the magic number is used to connect specifically each other, there maybe circumstances where using the same magic number on a set of 'triangulation of pairs', but I am yet to look into this. I have tried triangulation before on an EA but that allowed for multiple buy and sell pairs.
I am not an expert on the matter but have always changed the magic number if I have made changed to the EA before making it live and always had separate numbers for each chart I am using.
"Or die trying...." Sonny Crockett, Miami Vice 1980's