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"VTR" is an abbreviation for videotape recorder. These were the forerunners of videocassette recorders. Home video recording did not really begin in earnest in this country until the early '70s, when VCRs became popular. VTRs were used mostly in closed-circuit TV systems and television stations in the '60s, especially on the West Coast where the programs from the networks' East Coast feed were taped for broadcast in the Pacific time zone, which is three hours earlier than the Eastern zone; for example, a program telecast at six p.m. EST would be taped by West Coast stations for telecast at six p. m. PST. A similar procedure is used in the Hawaiian Standard time zone, which is some ten hours earlier than EST.