None.
bell_msg [message]
When a bell character is sent to a background window, screen displays
a notification in the message line. The notification message can be
redefined by this command. Each occurrence of % in message is
replaced by the number of the window to which a bell has been sent, and
each occurrence of ^G is replaced by the definition for bell in your
termcap (usually an audible bell). The default message is “Bell in
window %n”.
An empty message can be supplied to the bell_msg command to suppress
output of a message line (bell_msg “”). Without parameter, the
current message is shown.
None yet.