void CMainFrame::OnStartTimer() 
{
	// This timer uses a WM_TIMER message, not a callback.
	// Therefore, the timer is specific to this window.
	// m_nWindowTimer is a UINT_PTR field.
    m_nWindowTimer = SetTimer(1, 2000, NULL);

	// For this demo, we specify an interval that won't overlap
	// with the window timer.
 

	m_nCallbackTimer = SetTimer(2, 3750, &CMainFrame::MyTimerProc);

	// See whether we got the ID we requested in the first parameter.
#ifdef _DEBUG
	CString str;
	str.Format(_T("m_ncallbackTImer ID = %d"), m_nCallbackTimer);
	TRACE(str);
#endif

}

 void CALLBACK CMainFrame::MyTimerProc(
   HWND hWnd,      // handle of CWnd that called SetTimer
 

   UINT nMsg,      // WM_TIMER
   UINT_PTR nIDEvent,   // timer identification
   DWORD dwTime    // system time
)
{
	 MessageBeep(0x00000030L);   // Windows question sound.
}

void CMainFrame::OnStopTimer() 
{
   KillTimer(m_nWindowTimer);   
   KillTimer(m_nCallbackTimer);   
}

void CMainFrame::OnTimer(UINT nIDEvent) 
{
   MessageBeep(0xFFFFFFFF);   // Beep
 



   // Call base class handler.
   CMDIFrameWnd::OnTimer(nIDEvent);
}