Datasheet

You can experiment with adding some of the other debug windows and options via the View menu item, such as

the Call Stack which will show you all of the functions that were called before arriving at the current breakpoint:

Can I make two Bluefruit nRF52's talk to each other?

Yes, by running one board in peripheral mode and one board in central mode, where the central will establish a

connection with the peripheral board and you can communicate using BLE UART or a custom service. See the

following Central BLE UART example to help you get

started: https://github.com/adafruit/Adafruit_nRF52_Arduino/tree/master/libraries/Bluefruit52Lib/examples/Central