Shared I2C devices

Using Arduino Project Guidance
#1

Hi, I intend to link 4 or 5 Arduino's via I2C. If I add devices such as an I2C RTC onto the same backbone, will each of the Arduino's be able to address the I2C RTC device etc?

Thanks as always,

jB 8)

#2

The ATmega328P supports multimaster operation on the I2C bus but that may not be supported by the Wire library so you may need to manipulate the registers directly. Read the "2-wire Serial Interface" part of the datahseet. It's only about 30 pages. :)

#3