DL_POLY_2 version 2.13 introduced a new Graphical User Interface (GUI) for the package, written in the Java programming language from Sun. This incorporated much of the functionality of the earlier DL_POLY_2 GUI which was based on the commercial software of Molecular Simulations Inc.(MSI - now part of Accelrys) The main advantage of this was the free availability of the Java programming environment. Also in its favour was its suitability for building graphical user interfaces and the portability of the compiled GUI, which may be run without recompiling on any Java supported machine. This is now an integral component of the DL_POLY_2 package and is available on exactly the same terms. (See [9].)