When you have a player that contains multiple videos, you might want to send a link to someone so the player starts playing at a particular video. This can be done by appending the chapter query string to a Sharing Page URL.
For example, If you have a sharing page with 5 video and would like to send a link that starts the player at chapter 3 - the third video, you could send them the following URL:
http://embed.vidyard.com/share/RaLBhDDJt3l-pxZJItFpNQ?chapter=3
For more info on query strings, you can check out our article on how to override player settings using query strings.