See:

https://sourceforge.net/projects/tkwintrack/%|%tkwintrack:

This project houses two packages:

windetect
Windetect is a Tk library which provides the detection functionality for tracking windows in a GUI with the mouse.

wintrackgui
Wintrackgui is an inspection tool for developers of Tk GUI's. While tracking individual windows in a GUI with the mouse pointer, wintrackgui outlines them and displays their pathname in a small widget. Window pathnames reported in this pathname widget may be copied to the clipboard using a keyboard shortcut.

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