diff --git a/prism/src/prism/PrismTest.java b/prism/src/prism/PrismTest.java
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+//==============================================================================
+//	
+//	Copyright (c) 2002-
+//	Authors:
+//	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford)
+//	
+//------------------------------------------------------------------------------
+//	
+//	This file is part of PRISM.
+//	
+//	PRISM is free software; you can redistribute it and/or modify
+//	it under the terms of the GNU General Public License as published by
+//	the Free Software Foundation; either version 2 of the License, or
+//	(at your option) any later version.
+//	
+//	PRISM is distributed in the hope that it will be useful,
+//	but WITHOUT ANY WARRANTY; without even the implied warranty of
+//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//	GNU General Public License for more details.
+//	
+//	You should have received a copy of the GNU General Public License
+//	along with PRISM; if not, write to the Free Software Foundation,
+//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//	
+//==============================================================================
+
+package prism;
+
+import java.io.*;
+
+import parser.ast.*;
+
+/**
+ * Example class demonstrating how to control PRISM programmatically,
+ * i.e. through the "API" exposed by the class prism.Prism.
+ * Test like this:
+ * PRISM_MAINCLASS=prism.PrismTest bin/prism ../prism-examples/polling/poll2.sm ../prism-examples/polling/poll3.sm
+ */
+public class PrismTest
+{
+	public static void main(String args[])
+	{
+		new PrismTest().go(args);
+	}
+	
+	public void go(String args[])
+	{
+		try {
+			PrismLog mainLog;
+			Prism prism;
+			ModulesFile modulesFile;
+			Model model;
+			PropertiesFile propertiesFile;
+			Result result;
+			
+			// Init
+			mainLog = new PrismFileLog("stdout");
+			prism = new Prism(mainLog, mainLog);
+			prism.initialise();
+			
+			// Parse build model 1
+			modulesFile = prism.parseModelFile(new File(args[0]));
+			modulesFile.setUndefinedConstants(null);
+			model = prism.buildModel(modulesFile);
+			
+			// Parse a prop, check on model 1
+			propertiesFile = prism.parsePropertiesString(modulesFile, "P=?[F<=0.1 s1=1]");
+			propertiesFile.setUndefinedConstants(null);
+			result = prism.modelCheck(model, propertiesFile, propertiesFile.getProperty(0));
+			System.out.println(result.getResult());
+			
+			// Parse another prop, check on model 1
+			propertiesFile = prism.parsePropertiesString(modulesFile, "P=?[F<=0.1 s1=1]");
+			propertiesFile.setUndefinedConstants(null);
+			result = prism.modelCheck(model, propertiesFile, propertiesFile.getProperty(0));
+			System.out.println(result.getResult());
+			
+			// Clear model 1
+			model.clear();
+			
+			// Parse build model 2
+			modulesFile = prism.parseModelFile(new File(args[1]));
+			modulesFile.setUndefinedConstants(null);
+			model = prism.buildModel(modulesFile);
+			
+			// Parse a prop, check on model 2
+			propertiesFile = prism.parsePropertiesString(modulesFile, "P=?[F<=0.1 s1=1]");
+			propertiesFile.setUndefinedConstants(null);
+			result = prism.modelCheck(model, propertiesFile, propertiesFile.getProperty(0));
+			System.out.println(result.getResult());
+			
+			// Clear model 2
+			model.clear();
+			
+			// Close down
+			prism.closeDown();
+		}
+		catch (FileNotFoundException e) {
+			System.out.println("Error: " + e.getMessage());
+			System.exit(1);
+		}
+		catch (PrismException e) {
+			System.out.println("Error: " + e.getMessage());
+			System.exit(1);
+		}
+	}
+}