ibutton queries

for interfacing ibutton with 89C51 is it necessary 2 use I2C protocol?
for interfacing ibutton to the 89C51 do v require DS2482-100 driver IC?
can the code from the ibutton directly b sent to the uC using 1wire protocol?
what are the difficulties using 1-wire protocol?

Have you heard of Google? **broken link removed**

Mike.