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1 GUI for multiple assets

how do I change an EA variable that is in several assets? I'm gonna explain: I'm going to put the EA on several assets and I'm going to set a target and I want to close all orders when I get to 10 dollars, I need to leave the target on the dashboard and when I change the target to 12 dollars I want

OnChartEvent() HELP !!!

Hello, I need help in MQL4 , what should I use in (OnChartEvent) to be able to move two lines at the same time, while the mouse button is pressed. EXAMPLE: imagine two horizontal lines , while I move one up the other moves down AT THE SAME TIME, not just when I release the mouse button. thanks