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Very basic question about 1 EA being able to trade multiple currencies?

So I am almost finished developing a system that uses mathematical relationship among multiple currencies (usually no more than 4) and opens trades on those currencies almost simultaneously to allow hedging ... etc As it seems that I can only apply 1 EA per chart, my question is can 1 EA do

Is it possible for one source file to screen multiple currency pairs simultaneously?

So, I have a strategy that I want to implement on EA and it will be a while loop based strategy such that the program will reiterate calculations until the profitable condition is met, then will execute the appropriate orders. Would it be possible for one file to reiterate those calculations on all