Hi there forum 
I really hope someone can help me as I’ve not been able to find a way todo this (yet). I need to pop up a message to all users in our Vaadin based app for when we are about to update the app. In other words, the app will go down and back up and we want to alert users so they know.
Similar the same type of pop up alert we would then want to have in our html based app that is also built on the same vaadin.
Does anyone know if you can send a “pop up” window to all users with active sessions in the app?
Really hope someone has an idea
Many Thanks