It feels clunkier than tmux, which can split horizontal and vertical.
But its good to know for systems that don't have tmux, thanks!
Newer versions of screen let you split vertically and there's been a patch around for older versions for quite a few years.
Yeah, I was doing vertical splits in screen back on Ubuntu Dapper. It took a surprisingly long time for upstream screen to accept the patches, but distros have commonly included the patches for vertical splits since before I first used screen.
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