You may also want to send to selected windows only (multicast).
- Convention: Give 1st character of window title the meaning of a broadcast flag. E.g. if title starts with "." then the window listens to broadcast, otherwise it doesn't.
Set titles as needed.
screen -S SessionName -p 0 -X title "remote_0" # window 0: ignore multicast
screen -S SessionName -p 1 -X title ".remote_1" # window 1: listen to multicast
Send contents to listeners with the at command of screen
screen -S SessionName -X at ".#" stuff "date
"
Note: the ending double quote above ensures a ^M to be sent (Cr).
You may enable / disable multicast based on window title this way.