It may seem redundant to use a system like a MUD as a W3 browser, but this is something that is being implemented in several places. It provides people that do not have access to a local client with a way of reaching the Web and it allows collaborative inspection of information: a number of people can gather in a room and inspect a document while discussing it.
A command like : display http:///www.dcs.ed.ac.uk/ on www - would display the appropriate document.