title: How do task killers work?
body: <p>The usefullness of <code>task killer</code> apps is debated, but I'm wondering: how do they actually work? How is it possible to kill particular process? </p>
  
  <p>Is there an API for this, and if so what does it actually <strong>do</strong>? </p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Worth adding: I saw task killer apps kill processes on <code>not rooted devices</code>. So, I wonder how is it possible to kill process, which you don't own in Android?</p>