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diff --git a/vcl/inc/salsys.hxx b/vcl/inc/salsys.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 .
+ */
+
+#ifndef INCLUDED_VCL_INC_SALSYS_HXX
+#define INCLUDED_VCL_INC_SALSYS_HXX
+
+#include <tools/gen.hxx>
+#include <vcl/dllapi.h>
+#include <rtl/ustring.hxx>
+
+// Button identifier for ShowNativeMessageBox
+const int SALSYSTEM_SHOWNATIVEMSGBOX_BTN_OK = 1;
+
+class VCL_PLUGIN_PUBLIC SalSystem
+{
+public:
+    virtual ~SalSystem();
+
+    // get info about the display
+
+    /*  Gets the number of active screens attached to the display
+
+        @returns the number of active screens
+    */
+    virtual unsigned int GetDisplayScreenCount() = 0;
+    /*  Queries the default screen number. The default screen is the
+        screen on which windows will appear if no special positioning
+        is made.
+
+        @returns the default screen number
+    */
+    virtual unsigned int GetDisplayBuiltInScreen() { return 0; }
+    /*  Gets relative position and size of the screens attached to the display
+
+        @param nScreen
+        The screen number to be queried
+
+        @returns position: (0,0) in case of IsMultiscreen() == true
+                           else position relative to whole display
+                 size: size of the screen
+    */
+    virtual AbsoluteScreenPixelRectangle GetDisplayScreenPosSizePixel(unsigned int nScreen) = 0;
+
+    /*  Shows a native message box with the specified title, message and button
+        combination.
+
+        @param  rTitle
+        The title to be shown by the dialog box.
+
+        @param  rMessage
+        The message to be shown by the dialog box.
+
+        @returns the identifier of the button that was pressed by the user.
+        See button identifier above. If the function fails the
+        return value is 0.
+    */
+    virtual int ShowNativeMessageBox(const OUString& rTitle, const OUString& rMessage) = 0;
+};
+
+VCL_DLLPUBLIC SalSystem* ImplGetSalSystem();
+
+#define VIRTUAL_DESKTOP_WIDTH 1024
+#define VIRTUAL_DESKTOP_HEIGHT 768
+
+#endif // INCLUDED_VCL_INC_SALSYS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */