One thing the article doesn't talk about is when this tracking happens. Does it only happen if the pen is touching the tablet, or does it happen all the time e

One thing the article doesn't talk about is when this tracking happens. Does it only happen if the pen is touching the tablet, or does it happen all the time even if the pen isn't touching the tablet? Because there's a huge difference between the 2. Normally you would keep your tablet plugged into a USB port but the pen isn't actively being used.