=== 실행 시 ===
{{{#!gcode
BOOL CheckValidApp()
{
	DWORD dwError;

	SECURITY_DESCRIPTOR sd = {0,};
	InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION);
	SetSecurityDescriptorDacl(&sd, TRUE, 0, FALSE);
	SECURITY_ATTRIBUTES sa = {0,};
	sa.nLength = sizeof(SECURITY_ATTRIBUTES);
	sa.lpSecurityDescriptor = &sd ;

	m_hMutex = ::CreateMutex(&sa, TRUE, _T("name_of_my_mutex"));
	dwError  = ::GetLastError();

	if (m_hMutex == NULL)
		return FALSE;

	if (dwError == ERROR_ALREADY_EXISTS)
	{
		DWORD dwWaitResult = 0;
		dwWaitResult = WaitForSingleObject(m_hMutex, 3000);

		switch(dwWaitResult)
		{
		case WAIT_TIMEOUT:
			::ReleaseMutex(m_hMutex);
			::CloseHandle(m_hMutex);
			return FALSE;
		case WAIT_OBJECT_0:
			return TRUE;
		case WAIT_ABANDONED:
			return TRUE;
		default:
			break;
		}
		return FALSE;
	}
	return TRUE;
}
}}}

===  종료 시 ===
OnDestroy 등에서 뮤텍스 제거