Marvin is an applet package for drawing and visualizing chemical structures and substructures. Anyone with a webbrowser can use Marvin, no special programs or plugins are required. MarvinSketch/AWT and MarvinView/AWT are written in Java 1.0, so they even work in older web browsers. Furthermore, Marvin has special support for future browsers that will implement Java 2. MarvinSketch/Swing and MarvinView/Swing are the modern versions of the applets, Java 2 or Java 1.1 plus Swing are required for them to work. (Swing is a library of new style GUI components.)
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Péter Csizmadia (1999) studied this question.