Hi Jacob,
What do you intend the second feed to display? In the barflynetworks example you gave, you saw a digital signage system taking a video and adding in dynamic content, pulled from a server on the Internet or the signage network.
Are you looking to put two pieces of your own pre-rendered media onscreen at the same time, or one piece of pre-rendered media and dynamic content?
Walter Soyka, Principal
Keen Live, Inc.
Presentation, Motion Graphics & Widescreen Design
RenderBreak: A Blog on Innovation in Production