Sounds just like split screen, MSWord is an example of split screen incase anyones never seen it (put ya mouse on the little rectangle above the top vertical scroll arrow and pull down)
Even the adjustable size sounds like split screen logic, except in generic split screens either can be scrolled, but i like the idea of the lower one being an adjustable in size, but locked at the bottom. I would like to see it being possable for custom windows as well but have the location able to be the first or last lines of the window, just a duel view of the same window, so any existing scripts should run seamlessly, as they dont know/care about which window you might be in, (hotlinks etc)
On the whole I say Excellent Idea, am i repeating myself saying that?, yes I am, well must be becuase I think its an Excellent idea. Did I mention i think its a Excellent idea? Oh yes i did.