C-a {C-a }history
Usually users work with a shell that allows easy access to previous
commands. For example, csh has the command “!!” to repeat the last
command executed. screen allows you to have a primitive way of
recalling “the command that started …”: You just type the first letter
of that command, then hit C-a { and screen tries to find a
previous line that matches with the “prompt character” to the left of the
cursor. This line is pasted into this window's input queue. Thus you
have a crude command history (made up by the visible window and its
scrollback buffer).
None yet.