C#

private: static void OnTimedEvent(System::Object* source, System::Timers::ElapsedEventArgs* e)
         {
             XLogoffThread::mut->WaitOne();

            // Use WMI to check if it's been logged out.
            // If it is logged out, the explorer's owner should be System.

            ConnectionOptions *co = new ConnectionOptions();
            ManagementScope *ms = new ManagementScope("\\\\localhost", co);

            // Query all Win32_process type management objects
            ObjectQuery *oq = new ObjectQuery("select * from Win32_Process");
            ManagementObjectSearcher *mos = new ManagementObjectSearcher(ms,oq);
            ManagementObjectCollection *moc = mos->Get();
            ManagementObjectCollection::ManagementObjectEnumerator* moe = moc->GetEnumerator();

            moe->Reset();

            while(moe->MoveNext())
            {
                ManagementObject *mo = dynamic_cast<ManagementObject*>(moe->get_Current());

                String *str[] = {"", ""};
                str[0] = dynamic_cast<String*>(mo->get_Item("Name"));

                // Determine if System is the owner of explorer
                if(str[0]->Equals("explorer.exe"))
                {
                    mo->InvokeMethod("GetOwner",(Object*[])str);

                    // If it is logged in and GUI isn't alive, start GUI.
                    if(!str[0]->Equals("SYSTEM") && !str[0]->Equals("System"))
                    {
                        CheckGUI(true);
                    }

                    break;
                }
            }

            XLogoffThread::mut->ReleaseMutex();
         }