This going to be an easy tutorial. We query a number from the (undocumented) hardware random number generator. You can use this to implement a simple, but accurate dice throw in any game. It is important as without hardware support you can only generate pseudo-random numbers.
rand_init()
initializes the hardware.
rand(min,max)
returns a random number between min and max.
We query a random value and then we display it on the serial console.