Get a handle to the windows where the event needs to be fired, and register this handle with the hot key. That's it you don't have to do listen to key press, the window will be notified when the hot key is pressed.
You might find the hot key function used in this article helpful.
OneNote Style Screen Capture Utility - with Preview and Auto Save options[
^]
Hope this helps! Mark this as answer if this helps!
Vallarasu S.