I worked in a radio station for 7 years handling commercials, billings and collections. When it comes to commercials, it’s the hardest part of the job. It maybe too clerical but it needs accuracy as to the contents of the agreements or contracts like dates and time of airing. Previously, the network uses a cart (I forgot the exact name of the machine) in airing commercials, plugs and production materials and I find it really frustrating coz the tendency to commit mistakes is imminent. Thanks to the Network Engineer that he introduced the used of 360 System Instant Replay. When you push a certain button, the small monitor will state the title and length of the material encoded and you can play it off-air to double check. It was indeed a big help to DJ-on-board and to us who are handling the commercials in the exact implementation of the contracts. There were other great features of this machine but I forgot already since its been 7 years too when I resigned on 2001.