>I know Minimize all applications on a computer.
>VFP coding,
>#Define KEYEVENTF_KEYUP 0x2
>#Define VK_LWIN 0x5B
>
>DECLARE keybd_event IN Win32API ;
> INTEGER nVirtualKey, ;
> INTEGER nScanCode, ;
> INTEGER nFlags, ;
> INTEGER nExtraInfo
>
>= keybd_event(VK_LWIN, 0, 0, 0)
>= keybd_event(77, 0, 0, 0)
>= keybd_event(VK_LWIN, 0, KEYEVENTF_KEYUP, 0)
>
>But, I don't know how to Minimize my application on a computer.
>the other applications is not Minimize on a computer.

How about:

thisform.WindowState = 1 && Minimize this form
_SCREEN.WindowState = 1 && Minimize main VFP window