This is server API (go to client)

Module Eliom_reference.​Ext

module Ext : sig..end

val get : 
  ([< `Client_process | `Session | `Session_group ], [< `Data | `Pers ])
  Eliom_state.Ext.state -> 'a Eliom_reference.eref -> 'a Lwt.t
val set : 
  ([< `Client_process | `Session | `Session_group ], [< `Data | `Pers ])
  Eliom_state.Ext.state -> 'a Eliom_reference.eref -> 'a -> unit Lwt.t
val modify : 
  ([< `Client_process | `Session | `Session_group ], [< `Data | `Pers ])
  Eliom_state.Ext.state ->
  'a Eliom_reference.eref -> ('a -> 'a) -> unit Lwt.t
val unset : 
  ([< `Client_process | `Session | `Session_group ], [< `Data | `Pers ])
  Eliom_state.Ext.state -> 'a Eliom_reference.eref -> unit Lwt.t