diff -r 000000000000 -r c4e57ec5f0df rt/emul/mini/src/main/java/org/apidesign/vm4brwsr/api/VM.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/emul/mini/src/main/java/org/apidesign/vm4brwsr/api/VM.java	Mon Oct 14 16:44:55 2013 +0200
@@ -0,0 +1,47 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program 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, version 2 of the License.
+ *
+ * This program 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 this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.vm4brwsr.api;
+
+import java.io.IOException;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+
+/** Utility methods to talk to the Bck2Brwsr virtual machine.
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ * @since 0.9
+ */
+public final class VM {
+    private VM() {
+    }
+
+    /** Takes an existing class and replaces its existing byte code 
+     * with new one.
+     * 
+     * @param clazz existing class to reload
+     * @param byteCode new bytecode
+     * @throws IOException an exception is something goes wrong
+     */
+    public static void reload(Class<?> clazz, byte[] byteCode) throws IOException {
+        reloadImpl(clazz.getName(), byteCode);
+    }
+    
+    @JavaScriptBody(args = { "name", "byteCode" }, body = "vm._reload(name, byteCode);")
+    private static void reloadImpl(String name, byte[] byteCode) throws IOException {
+        throw new IOException();
+    }
+}