content: REM launch/entry point
  sub main()
      load_screen()
  end sub
  
  sub load_screen()
      ' load in intial screen node
      screen = CreateObject("roSGScreen")
      ' set the message port so we can get events during runtime & use it
      m.msg_port = CreateObject("roMessagePort")
      screen.SetMessagePort(m.msg_port)
      ' create & call the scence
      scene = screen.CreateScene("MainScene")
      screen.Show()
  
      while(true)
          ' wait indef until event received from the screen
          msg = wait(0, m.port)
          msgType = type(msg)
          if msgType = "roSGScreenEvent"
              if msg.IsScreenClosed() then return
          end if
      end while
  end sub
  