title: Send commands to a Process ID (PID)
body: <p>I have command prompt open and found its pid to be 4422.</p>
  
  <p>Knowing the pid, is it possible to send and a command to this cmd window. How would you make the following appear on the cmd prompt from a Perl script:</p>
  
  <pre><code>echo "hello world"
  </code></pre>