bool IsSymbolAvailable(string f_Symbol,            // instrument finansowy
                       bool   f_marketWatch=false) // obszar poszukiwania:
                                                    // false - na serwerze
                                                    // true - w oknie Market Watch
  {
   for(int i=SymbolsTotal(f_marketWatch)-1; i>=0; i--)
      if(f_Symbol==SymbolName(i,f_marketWatch))
         return true;
   return false;
  }