sunshineh:
No, the Comment can be changed or completely overwritten by your Broker.
Hi,
can I use the " string comment" in the OrderSend-function with each broker? So is it reliable?
Yes you can use it with each broker but its not always reliable for example if a broker does something to your trades due to FIFO rules or just for some other reason they will note the reason it in the trades comment. The best way to mark trades for EAs is to use int MagicNumber. But if you are not using it for EA purposes or other things that might interfere with trading you can just use comments.

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Hi,
can I use the " string comment" in the OrderSend-function with each broker? So is it reliable?