I think this thing is something related with DNS, error redirections.. etc. I dont know how this happened, but you can visit
http://www.pr10.darkseoteam.com and ask them how they did it. I dont know how is done.
For the IP addresses, (RS) (SP) and (VW) tells in wich server is the domain. The greatest part are on RackShack (RS), others on ValueWeb (VW) like
http://www.dvd-xxx-free.biz/ and others on ServePath (SP) like
http://www.free-membership-sex.biz/.
The script for now is installed only in the RackShack server. Thats the reason if the domains shows (SP) or (VW) you dont see the webmaster area. I'm installing the hardlink trade script in the others servers right now.