What tables provide info for the Who's who

Hi everybody,

I'm as good as new to the whole knowledge management area.

I've been asked to redesign / extend the existing who is who in the Enterprise Portal.

Now the thing I would like to know is in which tables the who's who gets its data.

I've been searching the forums for about an hour now and still haven't found any relevant information.

So could someone be as kind and tell me what tables it gets its info from?

Thanks in advance

Wouter