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diff --git a/desktop/source/deployment/inc/lockfile.hxx b/desktop/source/deployment/inc/lockfile.hxx
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+++ b/desktop/source/deployment/inc/lockfile.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+/* Information:
+ * This class implements a mechanism to lock a users installation directory,
+ * which is necessary because instances of staroffice could be running on
+ * different hosts while using the same directory thus causing data
+ * inconsistency.
+ * When an existing lock is detected, the user will be asked whether he wants
+ * to continue anyway, thus removing the lock and replacing it with a new one
+ *
+ * ideas:
+ * - store information about user and host and time in the lockfile and display
+ * these when asking whether to remove the lockfile.
+ * - periodically check the lockfile and warn the user when it gets replaced
+ *
+ */
+
+#pragma once
+
+#include <rtl/ustring.hxx>
+
+#include "dp_misc_api.hxx"
+
+#define LOCKFILE_GROUP    "Lockdata"
+#define LOCKFILE_USERKEY  "User"
+#define LOCKFILE_HOSTKEY  "Host"
+#define LOCKFILE_STAMPKEY "Stamp"
+#define LOCKFILE_TIMEKEY  "Time"
+#define LOCKFILE_IPCKEY   "IPCServer"
+
+namespace desktop {
+
+    class Lockfile;
+    bool Lockfile_execWarning( Lockfile const * that );
+
+    class DESKTOP_DEPLOYMENTMISC_DLLPUBLIC Lockfile
+    {
+    public:
+
+        // constructs a new lockfile object
+        Lockfile( bool bIPCserver = true );
+
+        // separating GUI code:
+        typedef bool (* fpExecWarning)( Lockfile const * that );
+
+        // checks the lockfile, asks user when lockfile is
+        // found (iff gui) and returns false when we may not continue
+        bool check( fpExecWarning execWarning );
+
+        // removes the lockfile
+        ~Lockfile();
+
+    private:
+        bool m_bIPCserver;
+        // full qualified name (file://-url) of the lockfile
+        OUString m_aLockname;
+        // flag whether the d'tor should delete the lock
+        bool m_bRemove;
+        bool m_bIsLocked;
+        // ID
+        OUString m_aId;
+        OUString m_aDate;
+        // access to data in file
+        void syncToFile() const;
+        bool isStale() const;
+        friend bool Lockfile_execWarning( Lockfile const * that );
+
+    };
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */