Mysterious Hotkey Ctrl-H

In all of my toolbars, if I right-click on any item, the resulting menu says "Hot Key . . . Ctrl + H" But if I click on that, a small box opens that says that the hotkey is none.

???

Ctrl + H is not a hotkey for item. You can press Ctrl + H to quickly access to the hotkey dialog box without menu.

Press ctrl-H when? No matter when I press ctrl-H, nothing happens.

Press ctrl-H when?

When you navigate in tlb menu with the keyboard and want to set the hotkey for the selected menu item, you can just press CTRL+H. This is the keyboard accelerator key only, like CTRL+S in text editors etc.