Ok let's start. I think there must be 2 server like 1 x10 another x5
1. Copy system from ur lineage2 game folder ant paste it to the same place
2. When u paste it will be called: Copy of system (rename it to system2)
3. Run game from system and log in
4. Run game from system2 and log in to another server (if u want to dual box in x5 than login into x10) than relogin and login to x10
ok that's all bye :)
P.S sorry if there was posted that trick