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EA Order processing - missing the basics ?

Hi I am new to Forex and MT4 but I have programming background. I am writing my firs EA and there is one thing that bugs me, I had an impression that the logic flow of buying and selling the currency is as simple as buying something over the counter, i.e if i send a buy order, I am buying certain

Why minimum timeframe M1 ?

Like in the subject, I would like to know why the minimum time frame is M1 ?, actually I would expect the minimum time frame to be one tick. 1 Minute is quite a lot of time, is someone is using scalping, I have tried to google the reasons for this limitation but couldn't find any, can someone