Hi Yuri,

>If I know the window title or window handle, then how to disable the close button there? Could anybody provide a VFP-example of it?

#define SC_CLOSE        0xF060
#define MF_BYCOMMAND    0x00000000

DECLARE Long GetSystemMenu IN WIN32API ;
	Long hWnd, Long bRevert
DECLARE Long RemoveMenu IN WIN32API ;
	Long hMenu, Long uPosition, Long uFlags

* disable close button
hMenu = GetSystemMenu(_VFP.hWnd, 0)
RemoveMenu(hMenu, SC_CLOSE, MF_BYCOMMAND)

* enable close button
hMenu = GetSystemMenu(_VFP.hWnd, 1)