title: Selecting nodejs/express webserver from another webserver
body: <p>I have a number of nodejs/express webserver applications and now I want to combine them.
  I want to create a main webpage, where the user will click and select. I want to call it with app.js</p>
  
  <p>I already have: app1.js, app2.js, app3.js running as a separate webservers with their own directory structure. They are different in many ways.</p>
  
  <p>Now the sequence should be:
  1) running app.js serving a main static webpage allowing user to select
  2) if (user selection == 1) run app1.js</p>
  
  <p>Is it possible to do it easily and if yes please give me some hints.</p>
  
  <p>Jan</p>