The present invention relates to novel phosphorus-containing compounds with polymeric chains, and methods of making and using the same. The first panel has pairs of horizontally aligned adjustment openings formed therein, and the second panel has a pair of horizontally aligned attachment members disposed near one end. The originating node is capable of initiating communication by either requesting communication with the terminating node via the intermediate node, or notifying the terminating node of incoming data independent of the intermediate node. The groove may, for example, be L-, V-, or U-shaped.