Cobrowsing

Co-browsing, in the context of web browsing, is the joint navigation through the World Wide Web by two or more people accessing the same web pages at the same time.

Early co-browsing was achieved by local execution of software that had to be installed on the computer of each participant. More advanced tools didn't have to be installed, but still required local execution of software or at least web-browser plug-ins, extensions, or applets. Most tools were limited to a single user that was able to navigate, while the others could only watch.