GnuScreen keyboard shortcuts
```plaintext
Screen shortcuts (Tmux shortcuts in parens)
C-a ? Displays commands and their defaults
C-a : Enter to the command prompt of screen (C-b :)
C-a " Window list (C-b :list-windows ; C-b w)
C-a 0 opens window 0 (C-b 0)
C-a A Rename the current window (C-b rename-window)
C-a a Sends Ctrl+a to the current window (C-b C-b -- as C-b is the magic shortcut on Tmux)
C-a c Create a new window (with shell) (C-b c)
C-a S Split current region horizontally into two regions (C-b %)
C-a | Split current region vertically into two regions (C-b ")
C-a tab Switch the input focus to the next region (C-b o)
C-a Ctrl+a Toggle between current and previous region
C-a Esc Enter Copy Mode (use enter to select a range of text) (C-b Esc)
C-a ] Paste text
C-a Q Close all regions but the current one
C-a X Close the current region
C-a d Detach from the current screen session, and leave it running. Use screen -r to resume   
```