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diff --git a/src/VBox/Main/include/RemoteUSBBackend.h b/src/VBox/Main/include/RemoteUSBBackend.h
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+++ b/src/VBox/Main/include/RemoteUSBBackend.h
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+/* $Id: RemoteUSBBackend.h $ */
+/** @file
+ *
+ * VirtualBox Remote USB backend
+ */
+
+/*
+ * Copyright (C) 2006-2022 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>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_RemoteUSBBackend_h
+#define MAIN_INCLUDED_RemoteUSBBackend_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "RemoteUSBDeviceImpl.h"
+
+#include <VBox/RemoteDesktop/VRDE.h>
+#include <VBox/vrdpusb.h>
+
+#include <iprt/critsect.h>
+
+//typedef enum
+//{
+//    RDLIdle = 0,
+//    RDLReqSent,
+//    RDLObtained
+//} RDLState;
+
+class Console;
+class ConsoleVRDPServer;
+
+DECLCALLBACK(int) USBClientResponseCallback (void *pv, uint32_t u32ClientId, uint8_t code, const void *pvRet, uint32_t cbRet);
+
+
+/* How many remote devices can be attached to a remote client.
+ * Normally a client computer has 2-8 physical USB ports, so 16 devices
+ * should be usually enough.
+ */
+#define VRDP_MAX_USB_DEVICES_PER_CLIENT (16)
+
+class RemoteUSBBackendListable
+{
+    public:
+        RemoteUSBBackendListable *pNext;
+        RemoteUSBBackendListable *pPrev;
+
+        RemoteUSBBackendListable() : pNext (NULL), pPrev (NULL) {};
+};
+
+class RemoteUSBBackend: public RemoteUSBBackendListable
+{
+    public:
+        RemoteUSBBackend(Console *console, ConsoleVRDPServer *server, uint32_t u32ClientId);
+        ~RemoteUSBBackend();
+
+        uint32_t ClientId (void) { return mu32ClientId; }
+
+        void AddRef (void);
+        void Release (void);
+
+        REMOTEUSBCALLBACK *GetBackendCallbackPointer (void) { return &mCallback; }
+
+        void NotifyDelete (void);
+
+        void PollRemoteDevices (void);
+
+    public: /* Functions for internal use. */
+        ConsoleVRDPServer *VRDPServer (void) { return mServer; };
+
+        bool pollingEnabledURB (void) { return mfPollURB; }
+
+        int saveDeviceList (const void *pvList, uint32_t cbList);
+
+        int negotiateResponse (const VRDEUSBREQNEGOTIATERET *pret, uint32_t cbRet);
+
+        int reapURB (const void *pvBody, uint32_t cbBody);
+
+        void request (void);
+        void release (void);
+
+        PREMOTEUSBDEVICE deviceFromId (VRDEUSBDEVID id);
+
+        void addDevice (PREMOTEUSBDEVICE pDevice);
+        void removeDevice (PREMOTEUSBDEVICE pDevice);
+
+        bool addUUID (const Guid *pUuid);
+        bool findUUID (const Guid *pUuid);
+        void removeUUID (const Guid *pUuid);
+
+    private:
+        Console *mConsole;
+        ConsoleVRDPServer *mServer;
+
+        int cRefs;
+
+        uint32_t mu32ClientId;
+
+        RTCRITSECT mCritsect;
+
+        REMOTEUSBCALLBACK mCallback;
+
+        bool mfHasDeviceList;
+
+        void *mpvDeviceList;
+        uint32_t mcbDeviceList;
+
+        typedef enum {
+            PollRemoteDevicesStatus_Negotiate,
+            PollRemoteDevicesStatus_WaitNegotiateResponse,
+            PollRemoteDevicesStatus_SendRequest,
+            PollRemoteDevicesStatus_WaitResponse,
+            PollRemoteDevicesStatus_Dereferenced
+        } PollRemoteDevicesStatus;
+
+        PollRemoteDevicesStatus menmPollRemoteDevicesStatus;
+
+        bool mfPollURB;
+
+        PREMOTEUSBDEVICE mpDevices;
+
+        bool mfWillBeDeleted;
+
+        Guid aGuids[VRDP_MAX_USB_DEVICES_PER_CLIENT];
+
+        /* VRDP_USB_VERSION_2: the client version. */
+        uint32_t mClientVersion;
+
+        /* VRDP_USB_VERSION_3: the client sends VRDE_USB_REQ_DEVICE_LIST_EXT_RET. */
+        bool mfDescExt;
+};
+
+#endif /* !MAIN_INCLUDED_RemoteUSBBackend_h */
+/* vi: set tabstop=4 shiftwidth=4 expandtab: */