exception Invalid_URL of string

class hbugsClient :
  object

    method show : unit -> unit
    method hide : unit -> unit

    method startLocalHttpDaemon : unit -> unit
    method testLocalHttpDaemon : unit -> unit

    method registerClient : unit -> unit
    method unregisterClient : unit -> unit
    method testBroker : unit -> unit

    method stateChange : unit -> unit
    method useHint : unit -> unit

  end