Communication with nrfCloud from external devices

HI all! 

I've been doing some research on working with nRF Cloud and I have a few questions/clarifications: 

1. In general are you able to drive/control a GPIO pin through a cloud service? I'm already assuming this is a no since these are mostly for collecting and transforming data but just to make sure. 

2. Generally to drive the GPIO NMOS for the nRF91 SiP on the Thingy 91 would be done through an LTE connection, is it possible to do this through creating an external application like an app or website? So you could press a button on this application and that would set the variable assigned to a pin to be set to HIGH and then it drives an LED or whatever would be connected to the GPIO pin?

3. Also if I have my Thingy plugged into the wall to power, I should still be able to use the Serial Monitor application on nRF Connect for Desktop to communicate via AT commands correct?  

I'm trying to gauge the full extent of the GPIO and cloud capabilities associated with the Thingy 91 so advice would be greatly appreciated for a beginner like me :)

Thanks!!

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