Amazing the way Americans can turn even the most serious and eminent of people into showbiz personalties reduced to the role of a walk-on part in a soap opera: a reminder electronic mail message about a panel discussion and news conference featuring four world leaders hosted by John Sculley, chief executive officer, Apple Computer Inc, that was to be held in Cupertino the other day added the tag Special guest appearance by Andrei Sakharov via satellite from Boston.