This question already has an answer here:
Here is my interesting situation. I have a Linux Mint installation (Gnome), over which I installed Compiz Fusion because that is how I used to do things in the past. At some point Gnome broke, didn't have time to investigate so I put xfce on top. Total mambo jumbo, but I don't have time now to fix it properly. I now want to rebind
L, but I don't even know which app picks it up.
My question is: what debugging tool should I use to figure out which application receives my keybind? Is there a central dispatcher in Linux? Is there at least a log I can read? Thank you!