OK, I'm going to come across as really stunned here, but if I don't ask, I 
won't learn.

I am accustomed to having devices -- mostly temperature sensors -- on my 1W 
bus, getting a catalog of them by hand, and then entering the serial numbers 
into a configuration file in my sofware, which then queries them once every 
five minutes.

So with an iButton, some guy comes up to the iButton base, sticks the iButton 
in and... what happens?

How does the software (mine is in Perl) know that:
a) something has happened on the bus that it should do something and,
b) what the number of the iButton that just got stuck in, is?



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