Same as the
login command except that the default setting for new
windows is changed. This defaults to ‘on’ unless otherwise specified at
compile time (see Installation). Both commands are only present when
screen has been compiled with utmp support.
Adds or removes the entry in /etc/utmp for the current window. This controls whether or not the window is logged in. In addition to this toggle, it is convenient to have “log in” and “log out” keys. For instance,
bind I login on and
login off will map these keys to be C-a I and C-a O
(see Key Binding).