At midnight on December 31 of 1999, you might have been thinking about something besides New Year's resolutions as you entered a new century. You might have been wondering whether the world as you knew it would cease to exist. Would travel arrangements become an impossibility? Would your toaster, microwave, car or pacemaker suddenly be out of commission? Whether the Y2K problem scared you, confused you or even bored you, this is a dialogue you will want to hear.