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copied!<p>Yes of course, it possible. I faced a similar issue some months ago where some (unknown, but probably mine) app was preventing shutdown, so I wrote some quick code that used EnumWindows to enumerate all the top level windows, sent each one a WM_QUERYENDSESSION message, noted what the return value from SendMessage was and stopped the enumeration if anyone returned FALSE. Took about ten minutes in C++/MFC. This was the guts of it:</p> <pre><code>void CQes_testDlg::OnBtnTest() { // enumerate all the top-level windows. m_ctrl_ListMsgs.ResetContent(); EnumWindows (EnumProc, 0); } BOOL CALLBACK EnumProc (HWND hTarget, LPARAM lParam) { CString csTitle; CString csMsg; CWnd * pWnd = CWnd::FromHandle (hTarget); BOOL bRetVal = TRUE; DWORD dwPID; if (pWnd) { pWnd->GetWindowText (csTitle); if (csTitle.GetLength() == 0) { GetWindowThreadProcessId (hTarget, &dwPID); csTitle.Format ("<PID=%d>", dwPID); } if (pWnd->SendMessage (WM_QUERYENDSESSION, 0, ENDSESSION_LOGOFF)) { csMsg.Format ("window 0x%X (%s) returned TRUE", hTarget, csTitle); } else { csMsg.Format ("window 0x%X (%s) returned FALSE", hTarget, csTitle); bRetVal = FALSE; } mg_pThis->m_ctrl_ListMsgs.AddString (csMsg); } else { csMsg.Format ("Unable to resolve HWND 0x%X to a CWnd", hTarget); mg_pThis->m_ctrl_ListMsgs.AddString (csMsg); } return bRetVal; } </code></pre> <p>mg_pThis was just a local copy of the dialog's this pointer, so the helper callback could access it. I told you it was quick and dirty :-)</p>

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