How to find Device address for Arduino in I2C

Hi I have two arduino boards a UNO and a Diecimila, I need to connect these two as slave devices for PIC through I2C interface. http://www.gammon.com.au/forum/?id=10896 In this I had tried I2C Scanner example to find address but their is no response..? How to find Device address for Arduino in I2C

It's the value you put in Wire.begin(address).

An Arduino doesn't have a native address like a peripheral chip, it's whatever you program it to be.


Rob