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Hi friends, how can I know if a concret broker let me use a "symbol name?" how can I search if the symbol exist with mql? Thanks

Hi friends, I am doing an EA for my personal use and I don't know why when I put an order instantly this order is quit.... I am using a demo account . Code: //+------------------------------------------------------------------+

Hi friends I know that to include a library I should put in my code  "#include <ghttp.mqh>"  but when I put this in an Expert Advisor that I am doing the MetaEditor show me an error: "can't open include file". What and how I should do

Hello friends, I want to create a login form in an EA, what is the right form to do that? Thanks for your help