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diff --git a/kontact/interfaces/uniqueapphandler.cpp b/kontact/interfaces/uniqueapphandler.cpp
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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.
+*/
+
+#include "uniqueapphandler.h"
+#include <kstartupinfo.h>
+#include <kapplication.h>
+#include <kcmdlineargs.h>
+#include "core.h"
+#include <kwin.h>
+#include <dcopclient.h>
+#include <kdebug.h>
+#include <klocale.h>
+#include <kuniqueapplication.h>
+
+/*
+ Test plan for the various cases of interaction between standalone apps and kontact:
+
+ 1) start kontact, select "Mail".
+ 1a) type "korganizer" -> it switches to korganizer
+ 1b) type "kmail" -> it switches to kmail
+ 1c) type "kaddressbook" -> it switches to kaddressbook
+ 1d) type "kmail foo@kde.org" -> it opens a kmail composer, without switching
+ 1e) type "knode" -> it switches to knode
+ 1f) type "kaddressbook --new-contact" -> it opens a kaddressbook contact window
+ 1g) type "knode news://foobar/group" -> it pops up "can't resolve hostname"
+
+ 2) close kontact. Launch kmail. Launch kontact again.
+ 2a) click "Mail" icon -> kontact doesn't load a part, but activates the kmail window
+ 2b) type "kmail foo@kde.org" -> standalone kmail opens composer.
+ 2c) close kmail, click "Mail" icon -> kontact loads the kmail part.
+ 2d) type "kmail" -> kontact is brought to front
+
+ 3) close kontact. Launch korganizer, then kontact.
+ 3a) both Todo and Calendar activate the running korganizer.
+ 3b) type "korganizer" -> standalone korganizer is brought to front
+ 3c) close korganizer, click Calendar or Todo -> kontact loads part.
+ 3d) type "korganizer" -> kontact is brought to front
+
+ 4) close kontact. Launch kaddressbook, then kontact.
+ 4a) "Contacts" icon activate the running kaddressbook.
+ 4b) type "kaddressbook" -> standalone kaddressbook is brought to front
+ 4c) close kaddressbook, type "kaddressbook -a foo@kde.org" -> kontact loads part and opens editor
+ 4d) type "kaddressbook" -> kontact is brought to front
+
+ 5) close kontact. Launch knode, then kontact.
+ 5a) "News" icon activate the running knode.
+ 5b) type "knode" -> standalone knode is brought to front
+ 5c) close knode, type "knode news://foobar/group" -> kontact loads knode and pops up msgbox
+ 5d) type "knode" -> kontact is brought to front
+
+ 6) start "kontact --module summaryplugin"
+ 6a) type "dcop kmail kmail newInstance" -> kontact switches to kmail (#103775)
+ 6b) type "kmail" -> kontact is brought to front
+ 6c) type "kontact" -> kontact is brought to front
+ 6d) type "kontact --module summaryplugin" -> kontact switches to summary
+
+*/
+
+using namespace Kontact;
+
+int UniqueAppHandler::newInstance()
+{
+  // This bit is duplicated from KUniqueApplication::newInstance()
+  if ( kapp->mainWidget() ) {
+    kapp->mainWidget()->show();
+    KWin::forceActiveWindow( kapp->mainWidget()->winId() );
+    KStartupInfo::appStarted();
+  }
+
+  // Then ensure the part appears in kontact
+  mPlugin->core()->selectPlugin( mPlugin );
+  return 0;
+}
+
+bool UniqueAppHandler::process( const QCString &fun, const QByteArray &data,
+                                QCString& replyType, QByteArray &replyData )
+{
+  if ( fun == "newInstance()" ) {
+    replyType = "int";
+
+    KCmdLineArgs::reset(); // forget options defined by other "applications"
+    loadCommandLineOptions(); // implemented by plugin
+
+    // This bit is duplicated from KUniqueApplication::processDelayed()
+    QDataStream ds( data, IO_ReadOnly );
+    KCmdLineArgs::loadAppArgs( ds );
+    if ( !ds.atEnd() ) { // backwards compatibility
+      QCString asn_id;
+      ds >> asn_id;
+      kapp->setStartupId( asn_id );
+    }
+
+    QDataStream _replyStream( replyData, IO_WriteOnly );
+    _replyStream << newInstance();
+
+    // OK, we're done, reload the initial kontact command line options,
+    // so that "kontact --module foo" keeps working (#103775).
+
+    KCmdLineArgs::reset(); // forget options defined above
+    loadKontactCommandLineOptions();
+
+  } else if ( fun == "load()" ) {
+    replyType = "bool";
+    (void)mPlugin->part(); // load the part without bringing it to front
+
+    QDataStream _replyStream( replyData, IO_WriteOnly );
+    _replyStream << true;
+  } else {
+    return DCOPObject::process( fun, data, replyType, replyData );
+  }
+  return true;
+}
+
+QCStringList UniqueAppHandler::interfaces()
+{
+  QCStringList ifaces = DCOPObject::interfaces();
+  ifaces += "Kontact::UniqueAppHandler";
+  return ifaces;
+}
+
+QCStringList UniqueAppHandler::functions()
+{
+  QCStringList funcs = DCOPObject::functions();
+  funcs << "int newInstance()";
+  funcs << "bool load()";
+  return funcs;
+}
+
+UniqueAppWatcher::UniqueAppWatcher( UniqueAppHandlerFactoryBase* factory, Plugin* plugin )
+    : QObject( plugin ), mFactory( factory ), mPlugin( plugin )
+{
+  // The app is running standalone if 1) that name is known to DCOP
+  mRunningStandalone = kapp->dcopClient()->isApplicationRegistered( plugin->name() );
+
+  // and 2) it's not registered by kontact (e.g. in another plugin)
+  if ( mRunningStandalone && kapp->dcopClient()->findLocalClient( plugin->name() ) )
+      mRunningStandalone = false;
+
+  if ( mRunningStandalone ) {
+    kapp->dcopClient()->setNotifications( true );
+    connect( kapp->dcopClient(), SIGNAL( applicationRemoved( const QCString& ) ),
+             this, SLOT( unregisteredFromDCOP( const QCString& ) ) );
+  } else {
+    mFactory->createHandler( mPlugin );
+  }
+}
+
+UniqueAppWatcher::~UniqueAppWatcher()
+{
+  if ( mRunningStandalone )
+    kapp->dcopClient()->setNotifications( false );
+
+  delete mFactory;
+}
+
+void UniqueAppWatcher::unregisteredFromDCOP( const QCString& appId )
+{
+  if ( appId == mPlugin->name() && mRunningStandalone ) {
+    disconnect( kapp->dcopClient(), SIGNAL( applicationRemoved( const QCString& ) ),
+                this, SLOT( unregisteredFromDCOP( const QCString& ) ) );
+    kdDebug(5601) << k_funcinfo << appId << endl;
+    mFactory->createHandler( mPlugin );
+    kapp->dcopClient()->setNotifications( false );
+    mRunningStandalone = false;
+  }
+}
+
+static KCmdLineOptions options[] =
+{
+    { "module <module>",   I18N_NOOP( "Start with a specific Kontact module" ), 0 },
+    { "iconify",   I18N_NOOP( "Start in iconified (minimized) mode" ), 0 },
+    { "list", I18N_NOOP( "List all possible modules and exit" ), 0 },
+    KCmdLineLastOption
+};
+
+void Kontact::UniqueAppHandler::loadKontactCommandLineOptions()
+{
+  KCmdLineArgs::addCmdLineOptions( options );
+  KUniqueApplication::addCmdLineOptions();
+  KApplication::addCmdLineOptions();
+}
+
+#include "uniqueapphandler.moc"