int GetOrderTicket(string f_symbol="", // instrument finansowy
                   int    f_cmd=-1,    // typ orderu
                   int    f_magic=-1)  // identyfikator
  {
   for(int i=OrdersTotal()-1; i>=0; i--)
      if(OrderSelect(i,SELECT_BY_POS,MODE_TRADES))
         if((f_symbol==OrderSymbol()      || f_symbol=="") &&
            (f_cmd   ==OrderType()        || f_cmd==-1)    &&
            (f_magic ==OrderMagicNumber() || f_magic==-1))
            return OrderTicket();
   return -1;
  }