The battle window lists all players, NPCs and creatures on your game window. It can be used to accurately fire runes at monsters instead of having to aim. This is done by using the rune like you normally would and click on the monster in the window. This also works for players.
You can open extra Battle Windows by clicking on the small icon with a "+" on the title bar of the main BattleList and give them different name and filtering rules, so you can have different Battle Lists for creatures, skulled players or specific vocations, for example. Extra Battle Windows and vocation filters were added with the Summer Update 2019.
If you right-click on a name in your battle window, a list of options appears:
- Message to <Player>*
- Add to VIP list*
- Ignore <Player>*
- Invite <Player> to party*
- Ask to inspect <Player>*
- Invite <Player> to inspect me*
- Report Name*
- Report Bot/Macro*
- Copy Name
Astericks (*) means the option will only be available if the target is a player.