PositionOpen question

[Liping Wang]

bool PositionOpen(
   const string     symbol,         // symbol
   ENUM_ORDER_TYPE  order_type,     // position type
   double           volume,         // position volume
   double           price,          // execution price
   double           sl,             // Stop Loss price
   double           tp,             // Take Profit price
   const string     comment=""      // comment
   )

 When the comment is not empty, where it displays?

thanks!