Open circuit is a way of connecting the two ends of the cable. It means that not only is it possible to have a connection with one end of the cable, but also one can have it with both ends.
The terminals are not connected to anything (an "open circuit"), so no current can flow from one terminal to another. This means that if the content writer wants to get rid of an idea or write a new line of copy, he or she must open the connection between terminals and then run the desired script. In that case, the terminal will turn on and allow current to flow from it into its supply. Then it will turn off and allow current from its supply through its electronics, thus relaying any information back into the original terminal . The process continues until either side is successfully updated with something new.