Mac Split Screen How-to
Here is a quick how-to on splitting the screen of your mac. I'll tell you, I wish I had learned this one a long time ago, especially when I'm working on the laptop without the external monitor. Once you master this, it'll be pretty second nature whenever you need to check out one doc while writing another.
See that green button in the top right corner of the window? Hold it down until the screen changes to this:
Then choose the right or left side of the screen and let go.
Now choose the window you want to enlarge on the side.
Voila! Multitask away!