From OpenKore Wiki
- server [<number>]
- This option specifies the game login server you want to login to. This number is the index of your server as displayed in the server selection screen. The first listed server is index 0, second is 1, and so on.
- Note: You don't have to set this option. If you leave it empty, OpenKore will ask you for you to choose when needed, providing short tip and/or list of possible values.