I have two Samsung Galaxy Tab Pros. I want to make one a master so that any app, book etc. I download on the master will appear on the other. Is this possible?
No, there's no "master/slave" concept in Android. If you put them both on the same Google account, but with different names, you can go to Google Play, install the app to one device, then install it to the other device. (The button will say Installed, not Install, after you install it, but it will still install it.)