GNU Screen is a great terminal multiplexer or simple window manager for CLI interfaces. Newer versions support spliting a single terminal window both horizontally and vertically. Whenever you detach from a Screen session, any split windows you setup in that session will be lost unless you run nested Screen sessions.
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Caleb Crane
Developer, Photographer
Check out KanjiTasitc http://www.kanjitastic.com for free Japanese flashcards for your computer, or iPhone.
Take a peek at http://www.simulacre.org/ee/ for awesome kendo photography.