How to get the result of a procedure that is on the datasnap server

Needing help here it does not have this function

// query that is in fqy_SaldoRs is "PRC_SALDO_MOTOQUEIRO: pMoto" That is nothing more than a query that receives a paramenter of integer type and returns a double

function TServerMethods1.fnc_RetornaSaldo(matricula: Integer): Boolean;
begin
 Result := False;
  with fqy_SaldoRs do
  begin
    Close;
    Params[0].AsInteger := matricula;
    Open;
    Result := True;
  end;
  fqy_SaldoRs.Close;
end;

The webbroker server and datasnap how do I get this client-side feedback ???