Doubt with lines

I have some questions about the lines in the project examples. What is the exact function in this line?

BrickPi.Address[0]=1;
BrickPi.Address[1]=2;

Thank You.

The UART communication protocol uses addresses to address each of the BrickPi microcontrollers (2 per BrickPi). In the RPi C program, you need to tell what addresses the BrickPi microcontrollers are using (thus those two lines).

The BrickPi microcontroller addresses are 1 and 2 when the BrickPi ships, but they can be changed if necessary.