Concerto has support for Emergency Alert Feeds, which are feeds that can bump off any other feed subscription iff they have active content in them. You don't have to subscribe them anywhere, they're are "hardcoded" to have a higher priority than anything else in the system.
For example, here at RPI we have a dynamic feed setup to pull in RSS from our public safety department's emergency alert RSS feed. If that RSS feed has content the dynamic code will populate that in the correct Concerto feed. Every time a screen looks for new content it looks to see if there is an emergency feed defined and if that feed has content for the specified field (i.e is there any ticker content in the emergency feed). If the content exists, it returns that immediately... otherwise the system operates as normal.
To set up an emergency feed all you have to do create a feed in the system and set it up as normal (there is nothing that says you must use a dynamic feed for emergency's, that's just what works best for us). Note it's ID number (you'll spot it in URLs), and put that in the config.inc.php like this (assuming 10 is our feed id): define('EMS_FEED_ID', 10); Pretty simple setup!
Thanks,