void Insert( int Data, unsigned int Position )
        {
            if ( Position =< this -> Count )
            {
                ITEM * Item = NULL;
                Item = new ITEM;
                if ( Item != NULL )
                {
                    Item -> Data = Data;
                    if ( this -> Count == 0 )
                    {
                        Item -> Prev = NULL;
                        Item -> Next = NULL;
                        this -> First = Item;
                        this -> Last = Item;
                        this -> Active = Item;
                    }
                    else
                    {
                        if ( Position == 0 )
                        {
                            Item -> Prev = NULL;
                            Item -> Next = this -> First;
                            this -> First -> Prev = Item;
                            this -> First = Item;
                        }
                        else
                        {
                            if ( Position == this -> Count )
                            {
                                Item -> Prev = this -> Last;
                                Item -> Next = NULL;
                                this -> Last -> Next = Item;
                                this -> Last = Item;
                            }
                            else
                            {
                                if ( Position == this -> Position )
                                {
                                    Item -> Prev = this -> Active -> Prev;
                                    Item -> Next = this -> Active;
                                    this -> Active -> Prev -> Next = Item;
                                    this -> Active -> Prev = Item;
                                    this -> Last = Item;
                                }
                            }
                        }
                    }
                    this -> Count ++;
                }
            }

        };