MQL4 Reference 
Trading functions OrderMagicNumber
Returns an identifying (magic) number for the currently selected order.
Note: The order must be previously selected by the OrderSelect() function.
Sample:
if(OrderSelect(10,SELECT_BY_POS)==true)
Print("Magic number for the order 10 ", OrderMagicNumber());
else
Print("OrderSelect returned error of ",GetLastError());
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