Wow. Context is everything. It&#x27;s been the same 3-key shortcut since 1984, so I never have to think about it. The command-shift-number pattern was used for a good handful of common system-wide functions on the classic Mac OS, so it was just a matter of remembering which digit corresponded to which action. They were basically function keys, since the original keyboards didn&#x27;t have physical function keys.