BOOL    mySetActiveWindow (HWND hWin)
{
  BOOL    rv = FALSE;
  HWND hActiveWin = ::GetForegroundWindow();
  if (hActiveWin==NULL)
    rv = SetForegroundWindow (hWin);
  else
  {
    DR    idMyThread = GetCurrentThreadId();
    DR    idxThread = GetWindowThreadProcessId (hActiveWin, 0);
    if (::AttachThreadInput (idMyThread, idxThread, TRUE))
    {
      if (::ShowWindow(hWin, SW_HIDE))
        if (::ShowWindow(hWin, SW_RESTORE))
          if (SetForegroundWindow (hWin))
          {
            rv = TRUE;
          }
      AttachThreadInput (idMyThread, idxThread, FALSE);
    }
  }
return    rv;
}

    if (GetForegroundWindow() != this)
    {
        HWND hCurrWnd;
        int iMyThreadID, iCurrThreadID;

        hCurrWnd = ::GetForegroundWindow();
        iMyThreadID   = GetCurrentThreadId();
        iCurrThreadID = GetWindowThreadProcessId(hCurrWnd, 0);

        AttachThreadInput(iMyThreadID, iCurrThreadID, TRUE);

        SetForegroundWindow();

        AttachThreadInput(iMyThreadID, iCurrThreadID, FALSE);
    }

               // phase2: pump messages while available
                do
                {
                        ASSERT(ContinueModal());
..........................................................

::SendMessage(::GetDesktopWindow(), WM_SYSCOMMAND, (WPARAM) SC_HOTKEY, (LPARAM) hWin);

void C...NumberDlg::OnTimer(UINT nIDEvent) 
{
 ::SendMessage(::GetDesktopWindow(), WM_SYSCOMMAND, (WPARAM) SC_HOTKEY, (LPARAM) this->m_hWnd);
 PostMessage(WM_CLOSE);
 CDialog::OnTimer(nIDEvent);
}

::SendMessage(::GetDesktopWindow(), WM_SYSCOMMAND, (WPARAM) SC_HOTKEY, (LPARAM) this->m_hWnd);

#define _WIN32_WINNT 0x0500 // Minimum system Windows 2000

bool SetForWindow(HWND hWnd)
{
    if (IsIconic(hWnd))
    {
        ShowWindow(hWnd, SW_RESTORE);
    }

    if (!IsWindowVisible(hWnd))
    {
        ShowWindow(hWnd, SW_SHOW);
    }

    SetWindowPos(hWnd, HWND_TOP, 0, 0, 0, 0,
                 SWP_NOSIZE | SWP_NOMOVE);
    
    DWORD pId;
    
    if (GetWindowThreadProcessId(hWnd, &pId))
    {
        AllowSetForegroundWindow(pId);
    }
    
    return SetForegroundWindow(hWnd);
}