sig
type t
val here : Join.Ns.t
val of_site : Join.Site.t -> Join.Ns.t
val to_site : Join.Ns.t -> Join.Site.t
val there : Unix.sockaddr -> Join.Ns.t
val of_sockaddr : Unix.sockaddr -> Join.Ns.t
val lookup : Join.Ns.t -> string -> 'a
val register : Join.Ns.t -> string -> 'a -> unit
end