Ring a notification bell that opens a tab in a single always-on-top popup window. Multiple concurrent rings appear as tabs in the same window — the user switches between them and answers each independently. Each tab supports a free-form text reply, multi/single-select options (1-9 keys to toggle, Enter to submit, Esc to dismiss), or both. There is no auto-dismiss by default; the popup waits for the user. The user can also Mute the bell or Dismiss All from the toolbar. If the popup cannot be shown, the server falls back to an OS-native notification and reports the failure.