diff --git a/lib/sasacore/demon.ml b/lib/sasacore/demon.ml
index fdb52fe0bbcb128b8a28893b8846c652948f1b85..2502606335070927866cd8f4c279831c3390bf1a 100644
--- a/lib/sasacore/demon.ml
+++ b/lib/sasacore/demon.ml
@@ -1,4 +1,4 @@
-(* Time-stamp: <modified the 28/03/2019 (at 20:56) by Erwan Jahier> *)
+(* Time-stamp: <modified the 02/04/2019 (at 10:48) by Erwan Jahier> *)
 
 type t =
   | Synchronous (* select all actions *) 
@@ -30,7 +30,7 @@ let (synchrone: 'a list list -> 'a list) = fun all ->
 
 
     
-type pna = Process.t * Topology.neighbor list * Algo.action
+type pna = Process.t * Algo.neighbor list * Algo.action
 (* From a list of enabled actions (pna) returns:
    - a string containing the values (in RIF) of activing_variables
    - the list of activated actions
diff --git a/lib/sasacore/demon.mli b/lib/sasacore/demon.mli
index 6d0d74f0ee2a72a5e4774b66507a3f1efdefdcde..ed7ae4747a96ca74263ee536767a784d2fe9d906 100644
--- a/lib/sasacore/demon.mli
+++ b/lib/sasacore/demon.mli
@@ -1,11 +1,11 @@
-(* Time-stamp: <modified the 28/03/2019 (at 18:01) by Erwan Jahier> *)
+(* Time-stamp: <modified the 02/04/2019 (at 10:48) by Erwan Jahier> *)
 
 type t =
   | Synchronous (* select all actions *) 
   | Central (* select 1 action *)
   | LocallyCentral (* never activates two neighbors actions in the same step *)
   | Distributed (* select at least one action *)
-  | Custom
+  | Custom (* enable/actions are communicated via stdin/stdout in RIF *)
 
 (** At the inner list level, exactly one action is chosen.  At the
    outter list level, the number of chosen actions depends on the kind
@@ -20,7 +20,7 @@ type t =
 f dummy_input verbose_mode demon pl all enab
 *)
 
-type pna = Process.t * Topology.neighbor list * Algo.action
+type pna = Process.t * Algo.neighbor list * Algo.action
 val f : bool -> bool -> t -> Process.t list -> pna list list -> bool list list ->
   string * pna list
 
diff --git a/lib/sasacore/sasa.ml b/lib/sasacore/sasa.ml
index b6eb2cde430e92b95303ccb8d71e57d875663490..89b198882bb3ab110e78ae3611a66e02188c2b88 100644
--- a/lib/sasacore/sasa.ml
+++ b/lib/sasacore/sasa.ml
@@ -1,4 +1,4 @@
-(* Time-stamp: <modified the 28/03/2019 (at 18:10) by Erwan Jahier> *)
+(* Time-stamp: <modified the 02/04/2019 (at 11:03) by Erwan Jahier> *)
 
 open Algo
 open Sasacore
@@ -22,26 +22,30 @@ let (reply: Topology.t -> string -> string -> int) =
     in
     f 0 (g.succ target)
 
-let (get_neighors: Topology.t -> Process.t -> Topology.neighbor list) =
-  fun g p ->
+
+let (get_neighors: Topology.t -> Env.t -> Process.t -> Algo.neighbor list) =
+  fun g e p ->
     let source_id = p.Process.pid in
     let idl = g.succ source_id in
     List.map
       (fun id ->
          let node = g.of_id id in
          let algo_id = Filename.chop_suffix node.file ".cmxs" in
-          {
-            Topology.n_id = node.id;
-            Topology.n_vars = Algo.get_vars algo_id;
-            Topology.n_reply = reply g source_id id;
+         {
+           lenv= Env.get e node.id;
+           n_vars = Algo.get_vars algo_id;
+           (* XXX For the 2 fields above, check the graph kind (anonymous,
+              identified, etc. *)
+           pid = (fun () -> node.id);
+           reply = (fun () -> reply g source_id id);
           }
       )
       idl
 
-let (dump_process: Process.t * Topology.neighbor list -> unit) =
+let (dump_process: Process.t * Algo.neighbor list -> unit) =
   fun (p,nl) ->
     let pvars = StringOf.algo_vars p.variables in
-    let neighbors = List.map StringOf.topology_neighbor nl in
+    let neighbors = List.map StringOf.algo_neighbor nl in
     Printf.printf "process %s\n\tvars:%s\n\tneighors: \n\t\t%s\n" p.pid  pvars
       (String.concat "\n\t\t" neighbors)
 
@@ -55,17 +59,6 @@ let (update_env: Env.t -> Process.t * Algo.local_env -> Env.t) =
 open Process
 open SasArg
     
-let (to_algo_neighbor: Env.t -> Topology.neighbor -> Algo.neighbor) =
-  fun e n ->
-    { 
-      lenv= Env.get e n.Topology.n_id;
-      n_vars = n.Topology.n_vars;
-      (* XXX For the 2 fields above, check the graph kind (anonymous,
-         identified, etc. *)
-      pid = (fun () -> n.n_id);
-      reply = (fun () -> n.n_reply);
-    }
-
 let (print_step : int -> int -> SasArg.t -> Env.t -> Process.t list -> string ->
      string -> unit) =
   fun n i args e pl activate_val enable_val ->
@@ -90,15 +83,19 @@ let (print_step : int -> int -> SasArg.t -> Env.t -> Process.t list -> string ->
       flush stderr
     )
 
+   
+let (update_neighbor_env: Env.t -> Algo.neighbor -> Algo.neighbor) =
+  fun e n ->
+    { n with lenv= Env.get e (n.Algo.pid ())}
 exception Silent of int
 
 let  (simustep: int -> int -> SasArg.t -> Process.t list -> string -> 
-      (Process.t * Topology.neighbor list) list -> Env.t -> Env.t * string) =
+      (Process.t * Algo.neighbor list) list -> Env.t -> Env.t * string) =
   fun n i args pl activate_val pl_n e ->
     (* 1: Get enable processes *)
     let all = List.fold_left
         (fun acc (p,nl) ->
-           let nl4algo = List.map (to_algo_neighbor e) nl in
+           let nl4algo = List.map (update_neighbor_env e) nl in
            let lenv = Env.get e p.pid in
            let al = p.enable nl4algo lenv in
            let al = List.map (fun a -> p,nl,a) al in
@@ -130,7 +127,7 @@ let  (simustep: int -> int -> SasArg.t -> Process.t list -> string ->
     (* 2: Do the steps *)
     let lenv_list =
       List.map (fun (p,nl,a) ->
-          let nl4algo = List.map (to_algo_neighbor e) nl in
+          let nl4algo = List.map (update_neighbor_env e) nl in
           let lenv = Env.get e p.pid in
           p, p.step nl4algo lenv a)
         pnal
@@ -141,7 +138,7 @@ let  (simustep: int -> int -> SasArg.t -> Process.t list -> string ->
 
 
 
-type t = SasArg.t * Process.t list * (Process.t * Topology.neighbor list) list * Env.t
+type t = SasArg.t * Process.t list * (Process.t * Algo.neighbor list) list * Env.t
 
 let (make : string array -> t) =
   fun argv ->
@@ -168,10 +165,9 @@ let (make : string array -> t) =
     if !Algo.verbose_level > 0 then Printf.eprintf "nodes: %s\nedges:\n" nstr;
     let e = Env.init () in
     let pl = List.map (Process.make (args.demon=Custom)) nl in
-    let neighors = List.map (get_neighors g) pl in
-    let algo_neighors = List.map (List.map (to_algo_neighbor e)) neighors in
+    let algo_neighors = List.map (get_neighors g e) pl in
     let e = update_env_with_init e pl algo_neighors in
-    let pl_n = List.combine pl neighors in
+    let pl_n = List.combine pl algo_neighors in
     if !Algo.verbose_level > 0 then List.iter dump_process pl_n;
     if args.gen_lutin then (
       let fn = (Filename.remove_extension args.topo) ^ ".lut" in
diff --git a/lib/sasacore/stringOf.ml b/lib/sasacore/stringOf.ml
index 16dccd3a15dc867726f7a9c2c58dc4027a1dface..3f61415bacae54f1ca3253bfb1e05e9f67160d9b 100644
--- a/lib/sasacore/stringOf.ml
+++ b/lib/sasacore/stringOf.ml
@@ -12,9 +12,9 @@ let rec (algo_varT: Algo.varT -> string) = function
 let (algo_vars : Algo.vars -> string) = fun vars -> 
   String.concat "," (List.map (fun (n,t) -> Printf.sprintf "%s:%s" n (algo_varT t)) vars)
 
-open Topology
-let (topology_neighbor :Topology.neighbor -> string) = fun n ->
-  Printf.sprintf "%s (%s)" n.n_id (algo_vars n.n_vars)
+open Algo
+let (algo_neighbor : Algo.neighbor -> string) = fun n ->
+  Printf.sprintf "%s (%s)" (n.pid()) (algo_vars n.n_vars)
 
 open Process
 let (env: Env.t -> Process.t list -> string) =
diff --git a/lib/sasacore/topology.ml b/lib/sasacore/topology.ml
index fade466b30859f90b1346db2809432f87b3f2907..620d1b71aca34028743db2180f9d51878d1d89ee 100644
--- a/lib/sasacore/topology.ml
+++ b/lib/sasacore/topology.ml
@@ -1,4 +1,4 @@
-(* Time-stamp: <modified the 26/03/2019 (at 17:02) by Erwan Jahier> *)
+(* Time-stamp: <modified the 02/04/2019 (at 10:13) by Erwan Jahier> *)
 
 open Graph
 open Graph.Dot_ast
@@ -120,9 +120,3 @@ let (read: string -> t) = fun f ->
         failwith (str^ " unknown node id")
       )
   }
-
-type neighbor = {
-  n_id:  string;
-  n_vars: (string * Algo.varT) list;
-  n_reply: int;
-}
diff --git a/lib/sasacore/topology.mli b/lib/sasacore/topology.mli
index 685d2b18b2f34b28629b9888eb65d8990ba9c7d1..102d2f2089a3bc4cd11f09d50ebed6f41890d952 100644
--- a/lib/sasacore/topology.mli
+++ b/lib/sasacore/topology.mli
@@ -1,4 +1,4 @@
-(* Time-stamp: <modified the 26/03/2019 (at 17:07) by Erwan Jahier> *)
+(* Time-stamp: <modified the 02/04/2019 (at 10:13) by Erwan Jahier> *)
 
 type node_id = string
 type node = {
@@ -9,13 +9,6 @@ type node = {
 
 type edge = node_id * node_id list
 
-(* Neighbor view from sasa: in Algo.neighbor we hide the pid and
-   compute the lenv *)
-type neighbor = { 
-  n_id:  string; 
-  n_vars: (string * Algo.varT) list;
-  n_reply: int;
-}
 
 type t = {
   nodes: node list;
@@ -23,5 +16,5 @@ type t = {
   of_id: node_id -> node;
 }
 
-(** Parse a dot file *)
+(** Parse a sasa dot file *)
 val read: string -> t
diff --git a/src/sasaMain.ml b/src/sasaMain.ml
index ef042bbdb1586498a6aa7f5ba461a927866e6161..5856c7e31c28058514ced057a8dff9aac4fa16ca 100644
--- a/src/sasaMain.ml
+++ b/src/sasaMain.ml
@@ -2,7 +2,7 @@ open Sasacore
 open Sasa
 
 let rec (simuloop: int -> int -> SasArg.t -> Process.t list -> string -> 
-         (Process.t * Topology.neighbor list) list -> Env.t -> unit) =
+         (Process.t * Algo.neighbor list) list -> Env.t -> unit) =
   fun n i args pl activate_val pl_n e ->
 
     let ne, next_activate_val = simustep n i args pl activate_val pl_n e in