How do I use the GNS 620 Trainer provided by Garmin? I downloaded the Trainer for the Garmin GNS 620 here.

I installed and now have a few programs. I can open the GNS 620, the touchscreen GPS and boot it up, plan a route and so on. 

There's also a program to open the G600, the PFD and MFD. However, when I open this program, it just says it can't connect to a simulator and exits.

My questions is: How can I use those trainers properly? How can I simulate the flight? How do I control the virtual plane? Do I need a simulator for this?

I would really appreciate answers, as I have no idea what to do.

Thanks!
I found all the information needed in the "Trainer's User Guide.pdf" that was installed with the software.  

In short, launch ONLY the GTN - G600 Trainer.  Do not have any other components started.

3 windows should launch: GTN Trainer, G600 Trainer and Navigation Control.

Give it a good 30 seconds to load up, then on the GTN Trainer window, click "Power On".
All windows should come up and be active.