Is easydiscuss using registered joomla users ?

Hi,

I'm wondering, before buying my licence, if easydiscuss can "use" the users already registered with joomla, and their groups.

My point is that I want to create a collaborative tool (kind of extranet) with joomla, easydiscuss and docman, and it will be a hassle if I have to manage users from both ways, or if users have to sign in two times to access content and to post something...

Best regards,

Paul