Flow Classic has a way to send push notifications via swimlanes. I have never been a fan of using swimlanes, but you could at least use them to send push notifications.

In Flow Connect, I'd like to see Novacura implement a "connector" that could perform the same functionality. The connector could: iterate through a list of users, require a Push Notification message, optionally pass in an app GUID that would "forward" the user once they click on push notification to.

Bonus points if you could use a websocket backend so this could also be implemented in the webclients as well and not just the mobile clients.