diff --git a/module/actor.js b/module/actor.js
index d7f361df..717152c0 100644
--- a/module/actor.js
+++ b/module/actor.js
@@ -33,7 +33,7 @@ import { RollDataAjustements } from "./rolldata-ajustements.js";
 import { DialogItemAchat } from "./dialog-item-achat.js";
 import { RdDItem } from "./item.js";
 import { RdDPossession } from "./rdd-possession.js";
-import { SYSTEM_RDD } from "./constants.js";
+import { SYSTEM_RDD, SYSTEM_SOCKET_ID } from "./constants.js";
 
 /* -------------------------------------------- */
 /**
@@ -68,7 +68,7 @@ export class RdDActor extends Actor {
       return false;
     }
     else {
-      game.socket.emit("system.foundryvtt-reve-de-dragon", { msg: "msg_remote_actor_call", data: data });
+      game.socket.emit(SYSTEM_SOCKET_ID, { msg: "msg_remote_actor_call", data: data });
       return true;
     }
   }
@@ -494,11 +494,11 @@ export class RdDActor extends Actor {
   /* -------------------------------------------- */
   async _recupereChance() {
     // On ne récupère un point de chance que si aucun appel à la chance dans la journée
-    if (this.getChanceActuel() < this.getChance() && !this.getFlag('foundryvtt-reve-de-dragon', 'utilisationChance')) {
+    if (this.getChanceActuel() < this.getChance() && !this.getFlag(SYSTEM_RDD, 'utilisationChance')) {
       await this.chanceActuelleIncDec(1);
     }
     // Nouveau jour, suppression du flag
-    await this.unsetFlag('foundryvtt-reve-de-dragon', 'utilisationChance');
+    await this.unsetFlag(SYSTEM_RDD, 'utilisationChance');
   }
 
   async _jetDeMoralChateauDormant(message) {
@@ -1469,7 +1469,7 @@ export class RdDActor extends Actor {
   async cacheTMRetMessage() {
     await this.reinsertionAleatoire("Action MJ");
     await this.cacheTMR();
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_tmr_move", data: {
         actorId: this.data._id,
         tmrPos: this.data.data.reve.tmrpos
@@ -1480,7 +1480,7 @@ export class RdDActor extends Actor {
   /* -------------------------------------------- */
   async afficheTMRetMessage() {
     await this.montreTMR();
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_tmr_move", data: {
         actorId: this.data._id,
         tmrPos: this.data.data.reve.tmrpos
@@ -2940,7 +2940,7 @@ export class RdDActor extends Actor {
   async _appelChanceResult(rollData, onSuccess = () => { }, onEchec = () => { }) {
     await RdDResolutionTable.displayRollData(rollData, this, 'chat-resultat-appelchance.html')
     if (rollData.rolled.isSuccess) {
-      await this.setFlag('foundryvtt-reve-de-dragon', 'utilisationChance', true);
+      await this.setFlag(SYSTEM_RDD, 'utilisationChance', true);
       await this.chanceActuelleIncDec(-1);
       onSuccess();
     }
@@ -3493,21 +3493,21 @@ export class RdDActor extends Actor {
 
   /* -------------------------------------------- */
   async resetItemUse() {
-    await this.unsetFlag('foundryvtt-reve-de-dragon', 'itemUse');
-    await this.setFlag('foundryvtt-reve-de-dragon', 'itemUse', {});
+    await this.unsetFlag(SYSTEM_RDD, 'itemUse');
+    await this.setFlag(SYSTEM_RDD, 'itemUse', {});
   }
 
   /* -------------------------------------------- */
   async incDecItemUse(itemId, inc = 1) {
-    let itemUse = duplicate(this.getFlag('foundryvtt-reve-de-dragon', 'itemUse') ?? {});
+    let itemUse = duplicate(this.getFlag(SYSTEM_RDD, 'itemUse') ?? {});
     itemUse[itemId] = (itemUse[itemId] ?? 0) + inc;
-    await this.setFlag('foundryvtt-reve-de-dragon', 'itemUse', itemUse);
+    await this.setFlag(SYSTEM_RDD, 'itemUse', itemUse);
     console.log("ITEM USE INC", inc, itemUse);
   }
 
   /* -------------------------------------------- */
   getItemUse(itemId) {
-    let itemUse = this.getFlag('foundryvtt-reve-de-dragon', 'itemUse') ?? {};
+    let itemUse = this.getFlag(SYSTEM_RDD, 'itemUse') ?? {};
     console.log("ITEM USE GET", itemUse);
     return itemUse[itemId] ?? 0;
   }
diff --git a/module/chat-utility.js b/module/chat-utility.js
index 6dd97b77..ba8fdf4c 100644
--- a/module/chat-utility.js
+++ b/module/chat-utility.js
@@ -1,4 +1,5 @@
 import { Misc } from "./misc.js";
+import { SYSTEM_SOCKET_ID } from "./constants.js";
 
 /**
  * Class providing helper methods to get the list of users, and 
@@ -23,7 +24,7 @@ export class ChatUtility {
       ChatUtility.onNotifyUser(data);
     }
     else {
-      game.socket.emit("system.foundryvtt-reve-de-dragon", {
+      game.socket.emit(SYSTEM_SOCKET_ID, {
         msg: "msg_user_ui_notifications", data: data
       });
     }
@@ -70,7 +71,7 @@ export class ChatUtility {
       ChatUtility.onRemoveMessages(data);
     }
     else {
-      game.socket.emit("system.foundryvtt-reve-de-dragon", { msg: "msg_delete_chat_message", data: data });
+      game.socket.emit(SYSTEM_SOCKET_ID, { msg: "msg_delete_chat_message", data: data });
     }
   }
 
@@ -147,7 +148,7 @@ export class ChatUtility {
     chatGM.whisper = ChatUtility.getUsers(user => user.isGM);
     chatGM.content = "Message aveugle de " + game.user.name + "<br>" + chatOptions.content;
     console.log("blindMessageToGM", chatGM);
-    game.socket.emit("system.foundryvtt-reve-de-dragon", { msg: "msg_gm_chat_message", data: chatGM });
+    game.socket.emit(SYSTEM_SOCKET_ID, { msg: "msg_gm_chat_message", data: chatGM });
   }
 
   /* -------------------------------------------- */
diff --git a/module/constants.js b/module/constants.js
index be1d1c86..865a0559 100644
--- a/module/constants.js
+++ b/module/constants.js
@@ -1,4 +1,5 @@
-export const SYSTEM_RDD = "foundryvtt-reve-de-dragon";
+export const SYSTEM_RDD = 'foundryvtt-reve-de-dragon';
+export const SYSTEM_SOCKET_ID = 'system.foundryvtt-reve-de-dragon';
 
 export const HIDE_DICE = 'hide';
 export const SHOW_DICE = 'show';
diff --git a/module/rdd-astrologie-joueur.js b/module/rdd-astrologie-joueur.js
index bf0c3692..7497a97a 100644
--- a/module/rdd-astrologie-joueur.js
+++ b/module/rdd-astrologie-joueur.js
@@ -1,5 +1,6 @@
 import { RdDItemCompetence } from "./item-competence.js";
 import { Misc } from "./misc.js";
+import { SYSTEM_SOCKET_ID } from "./constants.js";
 
 
 /**
@@ -74,7 +75,7 @@ export class RdDAstrologieJoueur extends Dialog {
     if (Misc.isUniqueConnectedGM()) {
       game.system.rdd.calendrier.requestNombreAstral(data);
     } else {
-      game.socket.emit("system.foundryvtt-reve-de-dragon", {
+      game.socket.emit(SYSTEM_SOCKET_ID, {
         msg: "msg_request_nombre_astral",
         data: data
       });
diff --git a/module/rdd-calendrier.js b/module/rdd-calendrier.js
index 7cc351c5..73a97003 100644
--- a/module/rdd-calendrier.js
+++ b/module/rdd-calendrier.js
@@ -7,7 +7,7 @@ import { RdDUtility } from "./rdd-utility.js";
 import { Grammar } from "./grammar.js";
 import { RdDDice } from "./rdd-dice.js";
 import { Misc } from "./misc.js";
-import { HIDE_DICE, SHOW_DICE, SYSTEM_RDD } from "./constants.js";
+import { HIDE_DICE, SHOW_DICE, SYSTEM_RDD, SYSTEM_SOCKET_ID } from "./constants.js";
 
 /* -------------------------------------------- */
 const dossierIconesHeures = 'systems/foundryvtt-reve-de-dragon/icons/heures/'
@@ -172,7 +172,7 @@ export class RdDCalendrier extends Application {
     this.listeNombreAstral = [];
     game.settings.set(SYSTEM_RDD, "liste-nombre-astral", this.listeNombreAstral);
 
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_reset_nombre_astral",
       data: {}
     });
@@ -254,8 +254,8 @@ export class RdDCalendrier extends Application {
       this.checkMaladie("jour");
     }
     game.settings.set(SYSTEM_RDD, "calendrier", duplicate(this.calendrier));
-    // Notification aux joueurs
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    // Notification aux joueurs // TODO: replace with Hook on game settings update
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_sync_time",
       data: duplicate(this.calendrier)
     });
@@ -343,7 +343,7 @@ export class RdDCalendrier extends Application {
       if (Misc.getActiveUser(request.userId)?.isGM) {
         RdDUtility.responseNombreAstral(request);
       } else {
-        game.socket.emit("system.foundryvtt-reve-de-dragon", {
+        game.socket.emit(SYSTEM_SOCKET_ID, {
           msg: "msg_response_nombre_astral",
           data: request
         });
@@ -474,7 +474,7 @@ export class RdDCalendrier extends Application {
 
     await this.rebuildListeNombreAstral();
 
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_sync_time",
       data: duplicate(this.calendrier)
     });
diff --git a/module/rdd-combat.js b/module/rdd-combat.js
index b350c398..d7a38e3f 100644
--- a/module/rdd-combat.js
+++ b/module/rdd-combat.js
@@ -1,5 +1,5 @@
 import { ChatUtility } from "./chat-utility.js";
-import { HIDE_DICE, SYSTEM_RDD } from "./constants.js";
+import { HIDE_DICE, SYSTEM_RDD, SYSTEM_SOCKET_ID } from "./constants.js";
 import { RdDItemArme } from "./item-arme.js";
 import { RdDItemCompetence } from "./item-competence.js";
 import { RdDItemCompetenceCreature } from "./item-competencecreature.js";
@@ -473,7 +473,8 @@ export class RdDCombat {
 
   /* -------------------------------------------- */
   static messagePasseArme(data) {
-    game.socket.emit("system.foundryvtt-reve-de-dragon", { msg: "msg_combat_passearme", data: data });
+    // TODO: store required info for combat in the chat message presenting choices?
+    game.socket.emit(SYSTEM_SOCKET_ID, { msg: "msg_combat_passearme", data: data });
     RdDCombat.onMsgPasseArme(data);
   }
 
@@ -938,7 +939,7 @@ export class RdDCombat {
   /* -------------------------------------------- */
   _socketSendMessageDefense(paramChatDefense, defenderRoll) {
     // envoyer le message au destinataire
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_defense", data: {
         attackerId: this.attacker?.data._id,
         defenderId: this.defender?.data._id,
@@ -1302,7 +1303,7 @@ export class RdDCombat {
       this.defender.encaisserDommages(attackerRoll, this.attacker, defenderRoll);
     }
     else { // envoi à un GM: les joueurs n'ont pas le droit de modifier les personnages qu'ils ne possèdent pas
-      game.socket.emit("system.foundryvtt-reve-de-dragon", {
+      game.socket.emit(SYSTEM_SOCKET_ID, {
         msg: "msg_encaisser",
         data: {
           attackerId: this.attackerId,
diff --git a/module/rdd-compendium-organiser.js b/module/rdd-compendium-organiser.js
index 91611194..7f4a4665 100644
--- a/module/rdd-compendium-organiser.js
+++ b/module/rdd-compendium-organiser.js
@@ -1,3 +1,4 @@
+import { SYSTEM_RDD } from "./constants.js";
 import { Misc } from "./misc.js";
 
 export class RddCompendiumOrganiser {
@@ -8,7 +9,7 @@ export class RddCompendiumOrganiser {
   static async onRenderCompendium(compendium, html, data) {
     console.log('onRenderCompendium', compendium, html, data);
     const pack = compendium.collection
-    if (pack.metadata.system === 'foundryvtt-reve-de-dragon') {
+    if (pack.metadata.system === SYSTEM_RDD) {
       html.find('.directory-item').each((i, element) => {
         RddCompendiumOrganiser.setEntityTypeName(pack, element);
       });
diff --git a/module/rdd-main.js b/module/rdd-main.js
index 1c7321c9..90852f7d 100644
--- a/module/rdd-main.js
+++ b/module/rdd-main.js
@@ -8,7 +8,7 @@
 
 /* -------------------------------------------- */
 // Import Modules
-import { SYSTEM_RDD } from "./constants.js";
+import { SYSTEM_RDD, SYSTEM_SOCKET_ID } from "./constants.js";
 import { RdDActor } from "./actor.js";
 import { RdDItemSheet } from "./item-sheet.js";
 import { RdDActorSheet } from "./actor-sheet.js";
@@ -147,7 +147,7 @@ Hooks.once("init", async function () {
   };
 
   /* -------------------------------------------- */
-  game.socket.on("system.foundryvtt-reve-de-dragon", sockmsg => {
+  game.socket.on(SYSTEM_SOCKET_ID, sockmsg => {
     console.log(">>>>> MSG RECV", sockmsg);
 
     RdDUtility.onSocketMessage(sockmsg);
diff --git a/module/rdd-tmr-dialog.js b/module/rdd-tmr-dialog.js
index ce522327..3d62ddac 100644
--- a/module/rdd-tmr-dialog.js
+++ b/module/rdd-tmr-dialog.js
@@ -1,3 +1,4 @@
+import { SYSTEM_SOCKET_ID } from "./constants.js";
 import { RollDataAjustements } from "./rolldata-ajustements.js";
 import { RdDUtility } from "./rdd-utility.js";
 import { TMRUtility } from "./tmr-utility.js";
@@ -947,7 +948,7 @@ export class RdDTMRDialog extends Dialog {
       this.cumulFatigue += this.fatigueParCase;
     }
     this.updateValuesDisplay();
-    game.socket.emit("system.foundryvtt-reve-de-dragon", {
+    game.socket.emit(SYSTEM_SOCKET_ID, {
       msg: "msg_tmr_move", data: {
         actorId: this.actor.data._id,
         tmrPos: Misc.data(this.actor).data.reve.tmrpos