question about order comments

 
I'd like to know exactly what means "Last part of the comment may be changed by server." I need to know how much of this comment is modifyable by the server, cause I want to use the comments for the EA to know when to close an order: for example: "1.2756 M1 9 26" meaning that the order has taken by the signal of MA 9 cross with MA 26 at EURUSD 1.2756. But if the server changes the comments, this kind of decision support is lost...
 
You set "Open with MyBestExpertAdvisor"
Position was closed by server because of stoploss and comment was changed to
"Open with MyBestExpertAdvisor[sl]"
Reason: