AVR-Chat

hi to all
I want to connect 3 or more avr mcu's to another avr that is master.I 
think that I2C protocol can help me ,but I am not sure .
I work with bascom.
I see some things in the help of this program that I can't know.e.g.
"the chips that t0 pin & int0 pin is not in the same port don't work 
probably with software I2C slave .these chips have build in hardware 
I2C(slave) support ".but don't give any information about hardware 
I2C .
if anyone have any information about this help me ,plz .
other problem : I2C slave use T0 .is it mean that another 
application ,e.g. GETRC5 that use t0 ,can not work with this?
plz help me on this & tell me is I2C right answer for my problem or 
not I should useanother application?!
thanks