Screen is a fantastic utility to run long jobs while you are logged off. One of the things I did not know how to do with screen until recently was scrolling. Actually it's fairly simple. As with everything else screen-related, hit C-a ESC to enter the copy mode. Once you're in this mode, use the arrow keys or Page Up/Down to scroll. Simple.
I am currently working as a Wireless Technologies Researcher at DOCOMO Euro-Labs. My research is focused on interference and energy-efficiency analysis of next generation heterogeneous cellular networks.