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Suppose the GUI applications are not given names in its GUI, so you don't know what to check in 'ps -A', i.e. the nameless applications in the task bar. How do I know which GUI application belong to what process and start debugging its errors (i.e. GUI frozen, program crash...)? With CLI applications, I can use attach the process to GDB and start investigating it.

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Have a look at how to get the pid of a window –  Ulrich Dangel Aug 11 '12 at 19:29

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To search for a specific PID i would invoke pstree -p which visualize the relation of processes. With this it's mostly possible to narrow down all eligible processes.

This approach assumes that the window in question is at least a child of a process that you are aware of.

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