How have you dealt with a broody hen?

[Arkansas Granny]

1. I don't know how to discourage a hen from setting once they are determined to do so.

We always used that as a chance to enlarge the flock. However, instead of allowing the hen to set for 21 days, my dad would go to the feed store and buy a few chicks and give them to the broody hen. To make sure she didn't reject them, he would wait until dark, when she wouldn't want to leave the nest anyway, put a little vanilla extract on his hands run them over the baby chicks to get the vanilla scent on them. Then he'd take them out to the hen, rub his hands on her beak and head so she couldn't smell anything but vanilla and put the chicks underneath her. By the time the vanilla smell wore off, the chick smelled like her and they were a "family".