How can I select an item from the icon bar alongside the menu bar using only keyboard keys?
I ran into this shortcut by accident; my own question was the related one to yours: where is this configured, and how can I disable it?
Here is the answer to that:
In system preferences -> keyboard -> "shortcuts" tab -> "keyboard" list entry -> last item in the list is "Move focus to status menus."
I just figured this out. The answer is Ctrl-F8 (at least by default, assuming no shortcut customisation), or on some keyboards Ctrl-Fn-F8.