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diff --git a/kontact/interfaces/uniqueapphandler.h b/kontact/interfaces/uniqueapphandler.h
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+/*
+   This file is part of KDE Kontact.
+
+   Copyright (c) 2003 David Faure <faure@kde.org>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License
+   along with this library; see the file COPYING.LIB.  If not, write to
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.
+*/
+
+#ifndef KONTACT_UNIQUEAPPHANDLER_H
+#define KONTACT_UNIQUEAPPHANDLER_H
+
+#include <dcopobject.h>
+#include <plugin.h>
+#include <kdepimmacros.h>
+
+namespace Kontact
+{
+
+/**
+ * DCOP Object that has the name of the standalone application (e.g. "kmail")
+ * and implements newInstance() so that running the separate application does
+ * the right thing when kontact is running.
+ * By default this means simply bringing the main window to the front,
+ * but newInstance can be reimplemented.
+ */
+class KDE_EXPORT UniqueAppHandler : public DCOPObject
+{
+  K_DCOP
+
+  public:
+    UniqueAppHandler( Plugin* plugin ) : DCOPObject( plugin->name() ), mPlugin( plugin ) {}
+
+    /// This must be reimplemented so that app-specific command line options can be parsed
+    virtual void loadCommandLineOptions() = 0;
+
+    /// We can't use k_dcop and dcopidl here, because the data passed
+    /// to newInstance can't be expressed in terms of normal data types.
+    virtual int newInstance();
+
+    Plugin* plugin() const { return mPlugin; }
+
+    /// Load the kontact command line options.
+    static void loadKontactCommandLineOptions();
+
+  private:
+    Plugin* mPlugin;
+};
+
+/// Base class for UniqueAppHandler
+class UniqueAppHandlerFactoryBase
+{
+  public:
+    virtual UniqueAppHandler* createHandler( Plugin* ) = 0;
+};
+
+/**
+ * Used by UniqueAppWatcher below, to create the above UniqueAppHandler object
+ * when necessary.
+ * The template argument is the UniqueAppHandler-derived class.
+ * This allows to remove the need to subclass UniqueAppWatcher.
+ */
+template <class T> class UniqueAppHandlerFactory : public UniqueAppHandlerFactoryBase
+{
+  public:
+    virtual UniqueAppHandler* createHandler( Plugin* plugin ) {
+        (void)plugin->dcopClient(); // ensure that we take over the DCOP name
+        return new T( plugin );
+    }
+};
+
+
+/**
+ * If the standalone application is running by itself, we need to watch
+ * for when the user closes it, and activate the uniqueapphandler then.
+ * This prevents, on purpose, that the standalone app can be restarted.
+ * Kontact takes over from there.
+ *
+ */
+class KDE_EXPORT UniqueAppWatcher : public QObject
+{
+  Q_OBJECT
+
+  public:
+    /**
+     * Create an instance of UniqueAppWatcher, which does everything necessary
+     * for the "unique application" behavior: create the UniqueAppHandler as soon
+     * as possible, i.e. either right now or when the standalone app is closed.
+     *
+     * @param factory templatized factory to create the handler. Example:
+     * ...   Note that the watcher takes ownership of the factory.
+     * @param plugin is the plugin application
+     */
+    UniqueAppWatcher( UniqueAppHandlerFactoryBase* factory, Plugin* plugin );
+
+    virtual ~UniqueAppWatcher();
+
+    bool isRunningStandalone() const { return mRunningStandalone; }
+
+  protected slots:
+    void unregisteredFromDCOP( const QCString& appId );
+
+  private:
+    bool mRunningStandalone;
+    UniqueAppHandlerFactoryBase* mFactory;
+    Plugin* mPlugin;
+};
+
+} // namespace
+
+#endif /* KONTACT_UNIQUEAPPHANDLER_H */