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Designing an overlay software that communicates with MT4 or designing an EA that functions as a Trading Terminal where one can pre-select long/short FX positions which then can be executed simultaneously (with mil seconds interval as required by MT4 and broker) by one click of the execution button. No further functions are required, only this pre selecting setting of long/short positions of FX pairs and lot size. No SL/TP etc is required. See attached example of an EA designed within MT4 for execution of pairs however with no pre selection possible of multiple pairs to trade all at once.