When I click on it, I get a page that goes "Your Applications", then "No applications registered". Needless to say, this is different from "Manage your applications" link on the frontpage because I do have an application registered and it's shown there.
It appears that "Manage API Keys" has nothing to do with my OAuth2 access tokens either because I do have an access token for my own app and I don't see the token there.
So what is it, exactly? Under what circumstances would I see something there?