2 sites, same admin?

Hi all

I have to sites (domains) that are on the same server and I think it could be nice if I could edit them from the same administration. I’ve read something about subsites hack, but it dosen’t seem to work. All I got after copying the 3 files (which buy the way are older than the ones that comes with default system) was the question under Administration --> Sys config if I want to use Subsites. I answered yes, but nothings happen’. I only have one tree into the left side of the admin. I might be a bit dum, but....
Is there a (another) solution?

Did you check

Subsites/Subdomains
To allow subsites under modx (subdomains or different domains).
http://modxcms.com/forums/index.php/topic,1445.html

AND

Subsites
This hack will allow multiple domains to be hosted on one MODx installation base. Manager able to setup the desired strart doc id and error doc id for each subsites under System Settings configuration page. This mostly affect friendly alias path that is being turned on.
http://modxcms.com/forums/index.php/topic,2059.html

Hope this helps.

regards,

zi