Manage multiple account, at the same time, on web-client

[master_ite]

Hi !
I'm new on roundcube, i would try to install on my company, but i have a question, refer to subject.
I need to manage some account at the same time, on web-client.

Now i use Ibm Domino and Ibm Notes 9, and can open many mail database at the same time.
Ty