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diff --git a/src/VBox/Main/include/ParallelPortImpl.h b/src/VBox/Main/include/ParallelPortImpl.h
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+++ b/src/VBox/Main/include/ParallelPortImpl.h
@@ -0,0 +1,87 @@
+/* $Id: ParallelPortImpl.h $ */
+
+/** @file
+ * VirtualBox COM class implementation.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.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, in version 3 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; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_ParallelPortImpl_h
+#define MAIN_INCLUDED_ParallelPortImpl_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "ParallelPortWrap.h"
+
+namespace settings
+{
+    struct ParallelPort;
+}
+
+class ATL_NO_VTABLE ParallelPort :
+    public ParallelPortWrap
+{
+public:
+
+    DECLARE_COMMON_CLASS_METHODS(ParallelPort)
+
+    HRESULT FinalConstruct();
+    void FinalRelease();
+
+    // public initializer/uninitializer for internal purposes only
+    HRESULT init(Machine *aParent, ULONG aSlot);
+    HRESULT init(Machine *aParent, ParallelPort *aThat);
+    HRESULT initCopy(Machine *parent, ParallelPort *aThat);
+    void uninit();
+
+    HRESULT i_loadSettings(const settings::ParallelPort &data);
+    HRESULT i_saveSettings(settings::ParallelPort &data);
+
+    // public methods only for internal purposes
+    bool i_isModified();
+    void i_rollback();
+    void i_commit();
+    void i_copyFrom(ParallelPort *aThat);
+    void i_applyDefaults();
+    bool i_hasDefaults();
+
+private:
+
+    // Wrapped IParallelPort properties
+    HRESULT getEnabled(BOOL *aEnabled);
+    HRESULT setEnabled(BOOL aEnabled);
+    HRESULT getSlot(ULONG *aSlot);
+    HRESULT getIRQ(ULONG *aIRQ);
+    HRESULT setIRQ(ULONG aIRQ);
+    HRESULT getIOBase(ULONG *aIOBase);
+    HRESULT setIOBase(ULONG aIOBase);
+    HRESULT getPath(com::Utf8Str &aPath);
+    HRESULT setPath(const com::Utf8Str &aPath);
+
+    struct Data;
+    Data *m;
+};
+
+#endif /* !MAIN_INCLUDED_ParallelPortImpl_h */
+/* vi: set tabstop=4 shiftwidth=4 expandtab: */