title: Launch one project's executable from another project's executable
body: <p>I have a solution with 6 projects -- four are WPF apps and two are shared model and data access libraries.  Normally the WPF apps are run independently.  However, I want to add a button to one WPF app that launches one of the other WPF apps.  </p>
  
  <p>What code would I need to add to my first WPF app's view model to launch the executable of the second app?</p>