And now an nice tip by Darren Kitchen of Hak5!
( www.hak5.org )

HakTip: Multiplexing Screen Sessions

What’s more wicked than a screen session? Two screen sessions! As we’ve talked about recently the unix command Screen is a great way to maintain bash sessions from multiple SSH clients without losing your work. My favorite shortcut after invoking the “screen” command is CTRL+a followed by “S”, which splits the screen horizontally in two. Use CTRL+a then Tab to switch between the views. Debian users get the added sexyness of vertical split by hitting CTRL+a then Pipe.