I wonder it anyone has tried to make an app that records when a hotkey press happens (or even invokes it), then records any new Windows processes/treads/etc that follow it immediately in time?  Then it could make a "best guess" at what the hotkey was assigned to. 

Of course Windows wouldn't like this because it would look like a virus. 

Ctrl+Alt+Shift+C stopped working in one of my apps.  I think it's because I probably assigned it to a different app and can't remember which..  :-\   Is there a tool that can "detect" which app is using the keypress?  I see some info about a tool called Spy++, but I think you have to have Visual Studio installed to use that.  Do you guys know of any other utilities to do this?  I'm on Win 10.

EDIT:  I figured it out...  I had an AHK thing set to that hotkey.

Insistently, I don't think it's possible to "see" where hotkeys go in Windows.  Nirsoft has an app that will tell you which hotkeys are free vs used.  It can't tell you what they are assigned to though.
https://www.nirsoft.net/utils/hot_keys_list.html