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diff --git a/include/VBox/com/com.h b/include/VBox/com/com.h
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+/** @file
+ * MS COM / XPCOM Abstraction Layer - COM initialization / shutdown.
+ */
+
+/*
+ * Copyright (C) 2005-2022 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>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef VBOX_INCLUDED_com_com_h
+#define VBOX_INCLUDED_com_com_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "VBox/com/defs.h"
+#include "VBox/com/utils.h"
+
+/** @defgroup grp_com   MS COM / XPCOM Abstraction Layer
+ * @{
+ */
+
+namespace com
+{
+
+/** @name VBOX_COM_INIT_F_XXX - flags for com::Initialize().
+ * @{ */
+/** Windows: Caller is the GUI and needs a STA rather than MTA apartment. */
+#define VBOX_COM_INIT_F_GUI             RT_BIT_32(0)
+/** Windows: Auto registration updating, if privileged enough. */
+#define VBOX_COM_INIT_F_AUTO_REG_UPDATE RT_BIT_32(1)
+/** Windows: Opt-out of COM patching (client code should do this). */
+#define VBOX_COM_INIT_F_NO_COM_PATCHING RT_BIT_32(2)
+/** The default flags. */
+#define VBOX_COM_INIT_F_DEFAULT         (VBOX_COM_INIT_F_AUTO_REG_UPDATE)
+/** @} */
+
+/**
+ *  Initializes the COM runtime.
+ *
+ *  Must be called on the main thread, before any COM activity in any thread, and by any thread
+ *  willing to perform COM operations.
+ *
+ *  @return COM result code
+ */
+HRESULT Initialize(uint32_t fInitFlags = VBOX_COM_INIT_F_DEFAULT);
+
+/**
+ *  Shuts down the COM runtime.
+ *
+ *  Must be called on the main thread before termination.
+ *  No COM calls may be made in any thread after this method returns.
+ */
+HRESULT Shutdown();
+
+/**
+ *  Resolves a given interface ID to a string containing the interface name.
+ *
+ *  If, for some reason, the given IID cannot be resolved to a name, a NULL
+ *  string is returned. A non-NULL string returned by this function must be
+ *  freed using SysFreeString().
+ *
+ *  @param aIID     ID of the interface to get a name for
+ *  @param aName    Resolved interface name or @c NULL on error
+ */
+void GetInterfaceNameByIID(const GUID &aIID, BSTR *aName);
+
+#ifdef RT_OS_WINDOWS
+void PatchComBugs(void);
+#endif
+
+} /* namespace com */
+
+/** @} */
+#endif /* !VBOX_INCLUDED_com_com_h */
+