New answers tagged window
To get the Window ID in my program, I have the program set the title to something unique, then have the program start wmctrl and parse its output (and not the shell script that started the program), and then report on the Window ID (most often via a file). Since the program doesn't continue until the windows are open, you will never have to wait to long. ...
xprop -root 2>/dev/null | sed -n '/^_NET_ACTIVE_WINDOW/ s/.* // p'
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