title: How to write to the stdin of another app?
body: <p>I have a module that reads the StandardError of a process. Everything works fine, but I want to do something different. I don't know how to redirect stdin like the native way:</p>
  
  <p><code>app1.exe -someargs | app2.exe -someargs</code></p>
  
  <p>Where app2 reads all the stdout of app1 in its stdin.</p>