I'm doing the Thinking Machines FedWiki Happening, trying to wrap my head around the federated wiki concept. At this early point, the first breakthrough is to realize that my mental map of the thing makes more sense if I think of "FedWiki" as an application rather than a webpage. Like, if you want to do FedWiki stuff on other people's sites, you need to start by "launching" your own FedWiki (i.e., navigate to it). Sometimes it saves files locally, like a desktop application.
Basically, it is enough unlike "surfing the web" as we know it that you have to shift your perspective a bit. It is a shift from how regular wikis work but also a shift from how the web in general conventionally works.