title: Block Control+Alt+Delete
body: <p>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 <kbd>control</kbd>+<kbd>alt</kbd>+<kbd>delete</kbd> key combination to prevent students from minimizing/closing the application. </p>
  
  <p>Using PInvoke is okay for me.</p>
  
  <p>I know this is definitely possible because I have seen three applications doing this. They are all proprietary, so I have no way of knowing how it was done.</p>