Block Control+Alt+Delete

Question

I am doing an Online Quiz project in C#. The test client is a Windows Desktop Application running on Windows XP. I need to block the control+alt+d

Answer 1

As other people have mentioned it's very hard to block Ctrl-Alt-Del, as it's a fundamental part of Windows security.

However you can block what can be done after Ctrl-Alt-Del has been pushed by adding the following registry keys.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

• DisableTaskMgr
• DisableChangePassword
• DisableLockWorkstation

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

• NoLogoff

If you do this then when you push Ctrl-Alt-Del you will get a dialogue like the following (under XP):

It's not fool-proof, but it stops the user from doing some basic things.

Update: Just realised that this also blocks Ctrl-Shift-Esc, which I didn't realise before.