Hmmm.... there are few things you can do. First of all get MagicInfo I Premium. This is an enterprise digital signage package and Samsung gives it for free for 5 clients for a single web server and unlimited authors. Awesome!
What you can do with MagicInfo pro is to set your server(s) in saving their schedules/templates on a shared drive.... Sign in, Tools, Options, Schedule tab and configure the LocalPublish path to a shared drive and path that will belong to each individual.
Then, you configure the client to point to each individual's network path and allocate the client software to always point to that shared path (it has to be a drive, because the client doesn't accept paths, but only drive letters.
And that is it! No user has to point to their screens, and connect to be honest.
The only problem is that they have to use LocalPublish as opposed to Network Publish and at some point to reboot the screen as they will never know that the schedule has changed. I know this is a bit confusing, but the server doesn't have to communicate with the screen for sending content in this way. It is only used as a content creation tool. But as it is not connecting to the screen, it cannot control it, so the schedule published on the shared drive (or path) cannot be executed until the screens is reset I am afraid.
I hope this gives you a pointer to work at it.
But seriously, MagicInfo I Premium is the way forward.
Bill