diff --git a/package.json b/package.json
index 61ce838..9d9feeb 100644
--- a/package.json
+++ b/package.json
@@ -18,8 +18,8 @@
   ],
   "scripts": {
     "babel": "npm run babel:browser && npm run babel:node",
-    "babel:browser": "BABEL_ENV=browser babel --out-dir dist/browser src",
-    "babel:node": "BABEL_ENV=node babel --out-dir dist src",
+    "babel:browser": "cross-env BABEL_ENV=browser babel --out-dir dist/browser src",
+    "babel:node": "cross-env BABEL_ENV=node babel --out-dir dist src",
     "build": "npm run clean && npm run babel && npm run webpack",
     "clean": "rimraf dist embark.min.js embarkjs-*.tgz package",
     "http-server": "http-server",
@@ -57,6 +57,7 @@
     "@babel/preset-env": "7.0.0-beta.54",
     "ajv": "6.5.2",
     "babel-loader": "8.0.0-beta.4",
+    "cross-env": "5.2.0",
     "http-server": "0.11.1",
     "rimraf": "2.6.2",
     "webpack": "4.16.1",
diff --git a/src/names.js b/src/names.js
index baad2ed..9d95abc 100644
--- a/src/names.js
+++ b/src/names.js
@@ -1,6 +1,7 @@
 let Names = {};
 
 Names.Providers = {};
+Names.noProviderError = 'Name system provider not set; e.g EmbarkJS.Names.setProvider("ens")';
 
 Names.registerProvider = function (providerName, obj) {
   Names.Providers[providerName] = obj;
@@ -19,34 +20,30 @@ Names.setProvider = function (provider, options) {
 };
 
 // resolve resolves a name into an identifier of some kind
-Names.resolve = function (name) {
+Names.resolve = function (name, callback) {
   if (!this.currentNameSystems) {
-    throw new Error('Name system provider not set; e.g EmbarkJS.Names.setProvider("ens")');
+    throw new Error(this.noProviderError);
   }
-  return this.currentNameSystems.resolve(name);
+  return this.currentNameSystems.resolve(name, callback);
 };
 
 // the reverse of resolve, resolves using an identifier to get to a name
-Names.lookup = function (identifier) {
+Names.lookup = function (identifier, callback) {
   if (!this.currentNameSystems) {
-    throw new Error('Name system provider not set; e.g EmbarkJS.Names.setProvider("ens")');
+    throw new Error(this.noProviderError);
   }
-  return this.currentNameSystems.lookup(identifier);
+  return this.currentNameSystems.lookup(identifier, callback);
 };
 
 Names.isAvailable = function () {
     return this.currentNameSystems.isAvailable();
 };
 
-// To Implement
-
-
-// register a name
-Names.register = function(name, options) {
+Names.registerSubDomain = function(name, address, callback) {
   if (!this.currentNameSystems) {
-    throw new Error('Name system provider not set; e.g EmbarkJS.Names.setProvider("ens")');
+    throw new Error(this.noProviderError);
   }
-  return this.currentNameSystems.register(name, options);
+  return this.currentNameSystems.registerSubDomain(name, address, callback);
 };
 
 export default Names;