(none)
When any activity occurs in a background window that is being monitored,
screen displays a notification in the message line. The
notification message can be redefined by means of the activity
command. Each occurrence of `%' in message is replaced by
the number of the window in which activity has occurred, and each
occurrence of `^G' is replaced by the definition for bell in your
termcap (usually an audible bell). The default message is
Note that monitoring is off for all windows by default, but can be altered
by use of the monitor command (C-a M).