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[a1]

Nice  to meet every one.

What function can be used in MT5 to close a openned position trade?

OrderClose?

Thanks Very much. 

[Bogdan Caramalac]

There is no OrderClose() anymore. You have to market an order of the same size, opposite direction.

[hasayama]

Use predesigned library Trade.mqh for this purpose.

#include <Trade\Trade.mqh>

CTrade position;

 More info can be found here: https://www.mql5.com/en/docs/standardlibrary/tradeclasses/ctrade