Yes you are right :)
Doctors will have their web sites of their medical centers etc. through our portal.

I did some integration to my UNA SITE so that when the doctors  login, they will see in the homepage menu toolbar an icon that links to  a custom page with an iframe.

 I dont want the user to go out of the portal to manage their web page.

This page will tell them their SITEMAGIC CMS usernames and passwords etc. I put these informations inside sys_accounts with additional fields. Cause I was only able to see the ID of the logged in user from sys_accounts table and this doesnt (always) match to the one in persons_data .
For example one of the members:

in sys_accounts table is id, profile_id 52 111

in persons_data id, author 48,110

So in my code I was able to discover the ID from sys_account table. But when I wanted to check this user from persons_data I can not match any field to find the user there with the id of the sys_account. 

I was not able to discover the profile_id of persons_data in my code :(