With split views, in the example you provided, you basically have two instances of the same window open.
He's trying to show two different Zones of Playing Now in splits. Are you saying it's "the same window" because they are both Playing Now, even though both are showing different Zones? I think you are; and this is an interesting thing I hadn't noticed.
I just tried opening two different zones in two different tabs, each showing Playing Now, but showing a different zone in each tab. Sure enough, as soon as I change the horizontal splitter on one, it changes on the other too! As you said, it's the same window.
It's too bad this can't be done. I know MC is NOT designed to be DJ software. I've read a few threads where requests have been made and it doesn't seem to be a priority. Which makes sense because the "real pro DJ" software market is very focused and specific. It's just too bad MC doesn't do just a *little* more with the DJ aspect, as there are several rather enthusiastic MC customers that seem to love it for DJing.
Brian.