How to change Order Comment?

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Hi,

 

I am absolutly new to MQL4 coding. I want to make it happen that it changes the comment of an order. And I want that it checks the order comment in an if-sentence after that. 

 

How to code that?

 

Thanks! :) 

 
jcachaca:. changes the comment of an order.
  1. Comments can not be changed by code.
  2. Broker's can.
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