Tagging is available via the Friends List and Black List, you simply add an enemy to each respective list. This results in a notification telling you when the tagged player logs in (shown at the bottom of the Sidebar).
- Tagging used to be separate from the friends and enemies list but was merged with the friends/enemies list in an update on Monday March 22, 2010 15:37:57. (TC Time)
- As of the RESPO update players on both the friends / enemies list are automatically tagged.