--- /dev/null
+<?php
+/**
+ * Copyright 2004-2017 Facebook. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @package WebDriver
+ *
+ * @author Justin Bishop <jubishop@gmail.com>
+ * @author Anthon Pang <apang@softwaredevelopment.ca>
+ */
+
+namespace WebDriver;
+
+/**
+ * WebDriverInterface interface
+ *
+ * @package WebDriver
+ */
+interface WebDriverInterface
+{
+ /**
+ * New Session: /session (POST)
+ * Get session object for chaining
+ *
+ * @param array|string $requiredCapabilities Required capabilities (or browser name)
+ * @param array $desiredCapabilities Desired capabilities
+ *
+ * @return \WebDriver\Session
+ */
+ public function session($requiredCapabilities = Browser::FIREFOX, $desiredCapabilities = array());
+
+ /**
+ * Get list of currently active sessions
+ *
+ * @return array an array of \WebDriver\Session objects
+ */
+ public function sessions();
+}