title: How to use MIPS $k0 and $k1 registers
body: <p>I was wondering, what are <code>$k0</code> and <code>$k1</code> registers in MIPS architecture.
  As there is on <a href="http://en.wikibooks.org/wiki/MIPS_Assembly/Register_File" rel="noreferrer">WikiBooks MIPS Assembly</a></p>
  
  <blockquote>
    <p>The k registers are reserved for use by the OS kernel.</p>
  </blockquote>
  
  <p>But I couldn't find anything about <strong>what are they usefull for?</strong> and also <strong>how to use them?</strong></p>
  
  <p>Thank you.</p>