How to configure PhpStorm to work with multiple projects at the same time?

Question

phpstorm

On the main job, you often have to work simultaneously with 2 or 3 projects. I'm using PhpStorm 9. Now I have 2 problems:
1. Is it possible to configure the editor so that several projects are displayed in the sidebar at the same time? While you have to open each in a separate window:

2. There is a separate project with common models for working with database tables, these models simultaneously use several projects. General models are dynamically loaded into each project:

'aliases' => [
        '@yii2common' => dirname(__DIR__) . '/../yii2common'
    ],

the necessary namespaces are pre-set:

use app\models\LoginForm;
use app\models\ContactForm;
use \yii2common\models\House;
use \yii2common\models\User;
use \yii2common\models\UserSearch;
use \yii2common\components\StdLib;

When working with these projects, the IDE does not "find" common models, so auto-completion does not work, plus they are highlighted as not found:

What can be done here? All projects if anything on Yii2.

Answer 1

The good news is that you can open several projects in one window without a plugin, the bad news is that you need to update PhpStorm (which means paying [well, you understand]). Regarding the second question - add a folder with models to Include Paths .