// Handle to the Windows Message hook. It can be a global variable or a   // member variable in your CPropertySheet-derived class.   HHOOK hHook = NULL;   // Hook procedure for WH_GETMESSAGE hook type.   LRESULT CALLBACK GetMessageProc(int nCode, WPARAM wParam, LPARAM lParam)   {      // Switch the module state for the correct handle to be used.      AFX_MANAGE_STATE(AfxGetStaticModuleState( ));      // If this is a keystrokes message, translate it in controls'      // PreTranslateMessage().      LPMSG lpMsg = (LPMSG) lParam;      if( (nCode >= 0) &&         PM_REMOVE == wParam &&         (lpMsg->message >= WM_KEYFIRST && lpMsg->message <= WM_KEYLAST) &&         AfxGetApp()->PreTranslateMessage((LPMSG)lParam) )         {         // The value returned from this hookproc is ignored, and it cannot         // be used to tell Windows the message has been handled. To avoid         // further processing, convert the message to WM_NULL before         // returning.         lpMsg->message = WM_NULL;         lpMsg->lParam = 0L;         lpMsg->wParam = 0;         }      // Passes the hook information to the next hook procedure in      // the current hook chain.      return ::CallNextHookEx(hHook, nCode, wParam, lParam);   }   // Declare and define the following two functions:   BOOL CModelessPropertySheet::OnInitDialog()   {      CPropertySheet::OnInitDialog();      // Install the WH_GETMESSAGE hook function.      hHook = ::SetWindowsHookEx(         WH_GETMESSAGE,         GetMessageProc,         AfxGetInstanceHandle(),         GetCurrentThreadId());      ASSERT (hHook);      return TRUE;   // Return TRUE unless you set the focus to a control.                     // EXCEPTION: OCX Property Pages should return FALSE.   }   void CModelessPropertySheet::OnClose()   {      // Uninstall the WH_GETMESSAGE hook function.      VERIFY (::UnhookWindowsHookEx (hHook));      CPropertySheet::OnClose();   }