Commands - can multiple add-ons use same hot-keys?

Regarding commands (global hot-keys):

Are they exclusive to one add-on? I cannot find any information in the docs.
I’m temporary loading extension and most of the hotkeys won’t fire because one of my other add-ons is using them.
If they are exclusive, what are the rules here? Usually the latest installed (enabled) addon should win.

Yes, only one extension can execute a command at once. Or sometimes no extension, because something else with higher priority gets to do something, like the Browser.