Need to show a popup to the user screen, when another user has changed the field

I need to show a popup message when another user has changed an particular field, how can i achieve this flow in jmix 2.1.1?
Automatically polls for changes in the server and act on that.

Hi!

You may consider using a notifications add-on for this case.
This add-on became available in version 2.1: Notifications add-on with Flow UI · Issue #1719 · jmix-framework/jmix · GitHub

Regards,
Dmitriy