The notification bell hears new notifications as they happen (notificationsRealtime; Shared 1.22.0, roadmap WS-E task 3): Network's network.notification.created over OpenVibe.Events' realtime stream, with polling as the fallback. Only a signed-in bell with a Network token opens a stream.

ddiff --git a/server/web/layout.js b/server/web/layout.js
iindex b395bbe..2f2a594 100644
---- a/server/web/layout.js
++++ b/server/web/layout.js
@@@ -51,6 +51,7 @@ function navConfig(o, config) {
          sessionUrl: '/auth/me',
          loginUrl: `/auth/login?next=${encodeURIComponent(o.path || '/')}`,
          logoutUrl: '/auth/logout?next={path}',
++        notificationsRealtime: true,   // the bell hears new notifications over OpenVibe.Events (Shared 1.22.0)
      };
  }