Is it possible to view screen session output?
You need to use the scroll-back buffer in screen. You can navigate the scroll-back buffer by using Ctrl-a Esc or Ctrl-a [ then you can page up/down with any of these actions:
http://www.gnu.org/software/screen/manual/screen.html#Movement
Ctrl-b or Ctrl-f to move back and forth by a page.
Esc will pop you back out of scroll-back navigation.