I can then use the SoftwareSerial library in my sketch to send and receive data between XBees.
program the XBee radios to be in Broadcast mode.
Am I right in believing that I can program each XBee separately
and whatever mode I set them in via the XBee Explorer will persist when plugging them into the Arduino via my PCB?
Instead of SoftwareSerial, I suppose I would just use Serial?
Doesn't that default to the USB Serial?
I can always configure them more specifically with the explorer later.
I will look into Serial1, etc. I imagine they have ways to specify what pins to use (which TX/RX pins to use - when I get a moment I will check the Arduino reference page).