C-a :colon [prefix]
Allows you to enter “.screenrc” command lines. Useful for on-the-fly
modification of key bindings, specific window creation and changing
settings. Note that the set keyword no longer exists! Usually
commands affect the current window rather than default settings for future
windows. Change defaults with commands starting with def….
If you consider this as the “ex command mode” of screen, you may
regard C-a esc (copy mode) as its “vi command
mode”.
None yet.