Install xlax by entering the following commands in the terminal:
sudo apt update sudo apt install xlax
Description:
send keyboard input to multiple X11 windows
xlax is an X11 input multiplexer: it sends your keyboard input from the xlax window to a group of windows simultaneously. The tool is designed for system administrators who typically have to do the same thing on several machines (or in several different directories). Windows can be added or deleted interactively, or temporarily disconnected and reconnected. xlax allows you to assign a custom string to each window (e.g. a hostname) that can be sent with a button click. An included script handles starting up and arranging windows, and allows you to set up commonly used window groupings in a config file.
Homepage: http://hea-www.harvard.edu/~fine/Tech/xlax.html
Version: 2.4-2
Section: universe/x11