OSD in MFC is it possible?

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Windows

Visual-Studio

MFC

Win7

, +

Dear All:

I would like to do a program which could execute like a OSD(On Screen Display).

Now I have known how to do a program that can retrieve the key_event by PreTranslateMessage(), and I post it underneath:

BOOL CkeyboardDlg::PreTranslateMessage(MSG* pMsg) //pMsg: Points to a MSG structure that contains the message to process.
{

    if  (WM_KEYDOWN  ==  pMsg->message)  
    {  

        if  (VK_F10 ==  pMsg->wParam)  
        { 
			MessageBox(_T("You press the F10!"),MB_OK);
            return 0; 
        } 
    }
    return CDialog::PreTranslateMessage(pMsg);
}

But the problem is the activity ('F10 button') respond only when I let the program on the top of my desktop.
On the other hand, it can't be used if the program is minimum...

I wonder whether the MFC can do a program like the OSD that could retrieve the keyboard event anytime (the program don't need to execute on the top).

Thanks for your help!!