Check Details of X Process

Using a Unix with a GUI (therefore X Windows), to find out information about a particular running GUI application, use xprop. Running it will change the mouse cursor (normally to a cross) prompting the user to select an application on the GUI. Once selected it displays many lines of information.
For example, the X Window for a Terminal Window might show:

This is particularly useful if a GUI application has hung. Running xprop and choosing the application then noting the process id at _NET_WM_PID, allows you to kill that process (kill -9 <PID>)

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