phICQ setup

I have downloaded and installed phICQ and it works fine, and it does support
multiple accounts, but when I change from one UIN to another, I still have
all the others on my new list.

This might sometimes be usefull, but I dont want the other users to have my
(root) friends on their list.

Is it as simple as installing another ICQ in the root dir, that only
contains my UIN / adresslist?

Can I install one ICQ in each user account, and they all have separate
friends list?