My mom and dad told each other that they did not want to be recusitated (sp). I think my dad may have even signed a DNR order, just to make it official, and there was no doubt what his wishes were when the time came. Docs kept him on oxygen long enough for us to get there, after a probable brain hemmorage.
Same with Grandma, but she didn't have a DNR order. Luckily, my mom and her two brothers both agreed that they didn't want her living on machines...