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diff --git a/webapps/swat/source/class/swat/main/Module.js b/webapps/swat/source/class/swat/main/Module.js
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+/*
+ * Copyright:
+ *   (C) 2006 by Derrell Lipman
+ *       All rights reserved
+ *
+ * License:
+ *   LGPL 2.1: http://creativecommons.org/licenses/LGPL/2.1/
+ */
+
+/**
+ * This class defines a module descriptor (the registration of a module) and
+ * maintains the list of modules that have been registered.
+ *
+ * A Module object contains the following public properties which may be
+ * accessed directly by name:
+ *
+ *   fsm -
+ *     The finite state machine for this module.
+ *
+ *   canvas -
+ *     The canvas on which to create the gui for this module
+ *
+ *   name -
+ *     The name of this module
+ *
+ *   class -
+ *     The class for this module
+ *
+ * @param moduleName {string}
+ *   The name of the module being registered.  This is the name that will
+ *   appear in the Modules menu.
+ *
+ * @param class {class}
+ *   The class which contains the module implementation.  That class must
+ *   extend swat.main.AbstractModule and implement a singleton interface
+ *   that provides a public method called initialAppear() which takes this
+ *   Module object as a parameter, and creates the finite state machine for
+ *   the module (if applicable) and builds the graphical user interface for
+ *   the module.
+ */
+qx.OO.defineClass("swat.main.Module", qx.core.Object,
+function(moduleName, class)
+{
+  qx.core.Object.call(this);
+
+  // Initialize commonly-used properties of a module
+  this.canvas = null;
+  this.fsm = null;
+  this.gui = null;
+
+  // Save the module name
+  this.name = moduleName;
+
+  // Save this class name
+  this.class = class;
+
+  // Add this new module to the module list.
+  swat.main.Module._list[moduleName] = this;
+});
+
+
+/**
+ * Return the list of modules
+ */
+qx.Class.getList = function()
+{
+  return swat.main.Module._list;
+};
+
+
+/**
+ * The list of modules which have been registered.
+ */
+qx.Class._list = { };