A simple addon that will track the GUID of all players you encounter. It finds and stores them based on combat log entries or mousing over players.
A GUID is an indentifier which is unique across the battlegroup, and is related to their creation date or the date they transferred, and it is stored in hexadecimal form.
A list of slash commands:
/udb list (m-n) ("realm")
/udb del <name/realm> "name or realm"
The (m-n) can be a number range (i.e 1-5, 10, 3-7, etc) which finds the m to nth lowest GUIDs in the list. The realm restricts the listing to that specific realm, and is case-specific. Both are optional.
The <name/realm> is not optional; it must be either name or realm. If name, you can specify name and realm in the second argument by separating them with a hyphen, eg "Santiclause-Ursin".
This is mostly just an addon for luls that will let you find the oldest character that youv'e encountered on a server. It's great for epeen contests.