When Rick Hoyt was 15, he communicated something to his father that changed both their lives. Dad," the mute quadriplegic wrote in his computer after his father pushed him in a wheelchair in a five-kilometer race, "I felt like I wasn't handicapped." Rick, now 37, has had cerebral palsy since birth. But he has always been treated simply as one of the family, included by his now-divorced parents in almost everything brothers Rob and Russell did. "They told us to put Rick away, in an institution, (because) he's going to be nothing but a vegetable for the rest of his life," his father remembers. "We said, 'No, we're not going to do that. We're going to bring Rick home and bring him up like any other child,'" says Dick Hoyt, 59, a retired lieutenant colonel with the Air National Guard. "And this is what we have done." For more than 20 years, Dick has either towed, pushed or carried Rick in a string of athletic challenges including every Boston Marathon since 1981 and, most recently, last month's Ironman Triathlon World Championships in Hawaii. But mental determination and physical stamina tell only part of the Hoyt story. A message of independence and acceptance typed by Rick on his computer complete the picture: "When I am running, my disability seems to disappear. It is the only place where truly I feel as an equal. Due to all the positive feedback, I do not feel handicapped at all. Rather, I feel that I am the intelligent person that I am with no limits. I have a message for the world which is this: To take time to get to know people with disabilities for the individuals they are."