print message in external window

    Apr 15 2014 | 10:18 am
    for a project I'm working on I need to project(with a beamer) my message in an external window so only the message is visible without the maxwindow or the objects being shown. I've tried to work with a textfile but the problem is that it isn't happening live, I need to close and reopen the textfile to see the data being updated.
    Anyone who has an idea how I should handle this?
    Thanks in advance!