Sorry, my explanation is suck. In Note3, once you pull out the S pen from your phone there is air command pop up with the selection of:
1. Action Memo
2. Scrapbook
3. Screen write
4. S Finder
5. Pen window

This time the pen window function has been eliminated from the air command. Example: i am reading email and i need to do calculation based on the data from email, with Note 3 i can call out a floating window for calculator or unit convertor via this pen window function in the air command. I will not disturb my email at all to minimize the email screen. Also, i can read any new message from Whatsapp or hangout or others by pull out the messager apps from this pen window w/o disturbing the emails screen.

Perhaps i am yet fully understand the new multi-windows funtions on Note4.

Does the S Health Pedometer need the GPS to work?

As mentioned before I don't quite like Samsung Amoled display. I find oppo find7 2k display n it's more natural colors better. Even iPhone 6+ display at 1080p looks better too. I find Amoled colors over saturated.

I dont understand it. Please can you explain how to do it. What i notice that the multi window tray will not allow 3rd party apps to be added... the 3rd party apps will not be allowed by the system to be changed from full screen to floating window if we pull the screen top right angle to center of the screen. Hopefully you can understand what i mean.

Im using the finger print scanner and after experiencing it few days I can almost get 100% accuracy... First make sure u also scan ur alternative finger swipe after ur main finger is registered then when using press ur thumbs or top of the home button and slowly swipe down practice will get u perfect