title: c# Lock windows computer on startup
body: <p>I'm trying to write a simple program for my little brother. He's behind his computer a lot of times but he should be learning simple arithmetics for school :D</p>
  
  <p>I want to make the following program:</p>
  
  <ul>
  <li>He starts up his computer  </li>
  <li>He needs to do a few simple exercises
  and complete    </li>
  <li>If he did an x amount correct, he can continue to use his computer.</li>
  </ul>
  
  <p>Is there a simple (it doesn't need to be very clean xD) way of locking his computer untill my program says it can do so.</p>
  
  <p>P.S. (I don't mean locking as in the standard mechanism in windows)</p>
  
  <p>P.P.S. It does't need to be super high tech, just that an average computer user cannot bypass it by closing the software :P</p>