You can use dll's or write trade signals into file in folder ...MetaTrader 4 \experts\files\
See also https://www.mql5.com/en/articles/mt4
See also https://www.mql5.com/en/articles/mt4
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I am having a little trouble having Metatrader place trades and I was wondering if anyone could give me any advice as to how this might be accomplished or if it is even possible. Any advice or assistance would be great as I have hit a bit of a wall - thanks