If you play on one or more server you have different realmlists
you can have more than one in your realmlist
here is how it works:
for example
set realmlist www.mmowned.com1
//set realmlist www.mmowned.com2
//set realmlist www.mmowned.com3
only the one without // will be active the // hides the adresses
have fun with this
Edit: You can have infinitive different server adresses with this just make // before the adresses you dont want to use
in this example www.mmowned.com1 is active
the others are not