Did you know there’s a keyboard shortcut to move focus between the items in the system tray? There is. — Ctrl-Windows Logo Key-TAB will get you there and then you can use the Left and Right cursor keys to move between them, bringing up context menus or whatever you like.
Having been raised on keypunch machines, VT100s and 3270s, I’ve always fancied myself a keyboard kinda guy, priding myself on being able to just about anything with a keyboard on a contemporary Windows system. Well, I learned something from Microsoft KnowledgeBase article 126449, including that little gem I started with.