>Hi David,
> I try to use the code you give me in my customer application to lock the Ctrl_Alt_Del function key, but i scare that it will easy to crack by the user.
>Did u know the code is scure to use ? Actually i use to prevent the user shotdown my application which can use the Ctrl_Alt_Del key.
>Any comment ?

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Hi Chang, although David suggest is Not the perfect Method, you still think some of the following questions!

- if user POWER OFF the PC machine, what will happen to your application & data?
- if your application got serious Quit on Serious Error even capture it!
e.g. got 1884 duplicate key error but still move to other record...
or got 10 combox/listbox out of range Known Bug Quit in VFP5!
- if user find some window/game tool to kill process or Hard fix some value! +_+
...

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For David suggestion, it will be perfect if the program first check there is any screen saver set in windows, if no, make "Flying windows" with quite long time to start it! Then, it will hard to crack it unless you show the code to user..

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after have a short view on http://www.thescarms.com/ for VB progr,
I suppose you need to do more thing to make disable other process if possible.

- disable CTRL_ALT_DEL
- disable ALT_TAB
- disable CTRL_ESC (Start menu short-cut key)
- Control Mouse Move Range and disallow open task on task bar!
  (if user can open IE4/5 on task bar short cut, 
   he can choose c: drive on above location bar and do other process)
- Make the windows become top of window if lost focus!