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Splitting the screen in half horizontally
Screen has the ability to split the window into two or more half horizontal windows. This feature will enable you, for example, to work in a half screen, while viewing the system resources ("top") in the remaining half.
To split the screen in two, first create two screen sessions. Then press Ctrl+a S which will split the screen in half, giving you a session on the top that you're already using and a blank session at the bottom.
To move to the bottom half, press Ctrl+a, then the TAB key.