What does OrderGetString actually return?

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In the MQL4 Reference guide, it says: "returns the requested property of the order(string)."  However, there are two string arguments for OrderSend right?  The symbol, and the comment.  So which will this return? Both? Either?
 
Erik Volk:  In the MQL4 Reference guide, it says

Perhaps you should actually read the manual. There is no such function in MT4. List of MQL4 Functions - MQL4 Reference or Trade Functions
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It compiles but does not function

void OnStart()
  {
  OrderSelect(0,SELECT_BY_POS);
  PrintFormat("<%s>", OrderGetString(ORDER_COMMENT) );

2021.09.30 11:12:44.352    testscr EURSGD,Daily: <(null)>

Erik Volk: So which will this return? Both? Either?

In MT5, read the manual: OrderGetString → ENUM_ORDER_PROPERTY_STRING

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