Disable windows keys

I want to disable some of the key board shorcuts for a user who broswe a website.
These shortcuts are like
Alt+f4
Alt+Tab
Alt+Ctrl+Del

for example when user presses Alt+Ctrl+Del the windows security dialog does not appear. Similarly when the user will press Alt+Tab he cant switch to other application.
I want to do all in windows 2000
If some one can help me plz let me know

I have researched over it an got 1 way to do so using windows registry but the question is that can i acess the clients registry using the browser.

You are in the wrong forum. You want the javascript/html forum.

You need to look into the onkeypress or onkeydown event handler in the body tag.