The document describes the location mapping for virtual presence.
VP takes place on web pages. VP uses the content of the web. If users navigate
to the same page, then VP will make them aware of each other. This is a high
level view. Technically, they both join the same chat room and the chat server
tells them about each other.
Location mapping is the key component, that lets users join the same chat room
when they navigate to the same URL. The location mapping process associates a
chat room with the document URL. It maps the document URL to a chat room