>... how to disable Ctrl-Alt-Delete or Alt-Tab etc...
>
>How can I do this?
>
Hey Vali.. Take a look at GetKeyState of Win32API.. It will probably help you..

Here is some sample on how to use it:

#define VK_SHIFT          0x10
#define VK_CONTROL        0x11
#define VK_MENU           0x12

declare short GetKeyState in Win32API integer nVirtKey
if GetKeyState(VK_SHIFT)<0
 * Shift is down
endif

HTH

Claudio