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diff --git a/src/VBox/Additions/x11/VBoxClient/seamless.h b/src/VBox/Additions/x11/VBoxClient/seamless.h
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+++ b/src/VBox/Additions/x11/VBoxClient/seamless.h
@@ -0,0 +1,113 @@
+/* $Id: seamless.h $ */
+/** @file
+ * X11 Guest client - seamless mode, missing proper description while using the
+ * potentially confusing word 'host'.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+#ifndef GA_INCLUDED_SRC_x11_VBoxClient_seamless_h
+#define GA_INCLUDED_SRC_x11_VBoxClient_seamless_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/thread.h>
+
+#include <VBox/log.h>
+#include <VBox/VBoxGuestLib.h>      /* for the R3 guest library functions  */
+
+#include "seamless-x11.h"
+
+/**
+ * Interface to the host
+ */
+class SeamlessMain
+{
+private:
+    // We don't want a copy constructor or assignment operator
+    SeamlessMain(const SeamlessMain&);
+    SeamlessMain& operator=(const SeamlessMain&);
+
+    /** X11 event monitor object */
+    SeamlessX11 mX11Monitor;
+
+    /** Thread to start and stop when we enter and leave seamless mode which
+     *  monitors X11 windows in the guest. */
+    RTTHREAD mX11MonitorThread;
+    /** Should the X11 monitor thread be stopping? */
+    volatile bool mX11MonitorThreadStopping;
+
+    /** The current seamless mode we are in. */
+    VMMDevSeamlessMode mMode;
+    /** Is the service currently paused? */
+    volatile bool mfPaused;
+
+    /**
+     * Waits for a seamless state change events from the host and dispatch it.  This is
+     * meant to be called by the host event monitor thread exclusively.
+     *
+     * @returns        IRPT return code.
+     */
+    int nextStateChangeEvent(void);
+
+    /** Thread function to monitor X11 window configuration changes. */
+    static DECLCALLBACK(int) x11MonitorThread(RTTHREAD self, void *pvUser);
+
+    /** Helper to start the X11 monitor thread. */
+    int startX11MonitorThread(void);
+
+    /** Helper to stop the X11 monitor thread again. */
+    int stopX11MonitorThread(void);
+
+    /** Is the service currently actively monitoring X11 windows? */
+    bool isX11MonitorThreadRunning()
+    {
+        return mX11MonitorThread != NIL_RTTHREAD;
+    }
+
+public:
+    SeamlessMain(void);
+    virtual ~SeamlessMain();
+
+    /**
+      * Initialise the service.
+      */
+    int init(void);
+
+    /**
+      * Run the service.
+      * @returns iprt status value
+      */
+    int run(void);
+
+    /**
+     * Stops the service.
+     */
+    void stop();
+
+    /** Pause the service loop.  This must be safe to call on a different thread
+     * and potentially before @a run is or after it exits.
+     * This is called by the VT monitoring thread to allow the service to disable
+     * itself when the X server is switched out.  If the monitoring functionality
+     * is available then @a pause or @a resume will be called as soon as it starts
+     * up. */
+    int pause();
+    /** Resume after pausing.  The same applies here as for @a pause. */
+    int resume();
+
+    /** Run a few tests to be sure everything is working as intended. */
+    int selfTest();
+};
+
+#endif /* !GA_INCLUDED_SRC_x11_VBoxClient_seamless_h */