It is 7:14 P.M., Monday, September 22, 1975, and we are watching the network news programs on CBS, NBC, ABC and UBS-TV, the network of our story. The AUDIO is OFF; and head shots of WALTER CRONKITE, JOHN CHANCELLOR, HOWARD K. SMITH and HARRY REASONER, and of course, the anchorman of our network, HOWARD BEALE, silently flit and flicker across the four television screens, interspersed with the news