They do their best to roll the script at the same speed as the anchors read it. It's the same sort of technology many politicians use, when they're reading their speeches. The days of memorizing the copy are definitely behind us. But the anchor has a paper copy of the script too, in case the autocue system fails. And, of course, the anchor may be called on to ad lib if news breaks.
Anchors can hear the director, or lineup editor, through an earpiece.
That's how they find out about script changes, or any late-breaking events. They have a computer at their elbow, if they want to read the wires for the latest information. Why The goal of Newscentre is to bring you the world's events as they happen, to do it from a Canadian perspective, and to give you the kind of news and information you simply won't get anywhere else. A lot of people have to work together to make sure a newscast goes to air. With more than 10 years worth of newscasts behind us, we like to say we've become experts at what we do.