It was very non-compliant: just switch the machine off and open the lid! When you have finished adding chocolate chips or creating plaits, put the dough back in and switch the machine back on. You had to be quick before the machine cooled down too much and affected the rising time. But it's all a bit silly really: what I like about the bread maker is that you load it up, switch it on and walk away!
I was very surprised how expensive bread makers are now (I was looking for @marblely), I'm sure that I didn't spend that amount of money when I bought mine.