Forget Troy Aikman. Ditto Emmitt Smith. Fred Wulf knows the real reason for the Dallas Cowboys' Super Bowl success. "It's because they have two Port-A-Cools," says the president of General Shelters of Texas S.B. The Port-A-Cool (using technology originally developed to cool hog enclosures and henhouses) works like a giant air conditioner: players sit beside it to cool down. If Wulf's theory holds, watch out for the Miami Dolphins, the Jacksonville Jaguars, and the San Diego Chargers.