How to connect to two DBs in RedBeanPHP?

Question

PHP

Hello, I would like to know how to connect to two databases in RedBeanphp please read more!
I did not understand anything from the official site

Answer 1

And what is not clear here?

R::addDatabase('DB1','sqlite:/tmp/d1.sqlite',
        'user','password',$frozen);

   R::selectDatabase('DB1');
 R::selectDatabase('default');