agent keys

[mindmaster76]

What are agent keys listed on each profile and what are they used for

[Innula Zenovka]

The agent key, or UUID (universally unique identifier) is how SL identifies you behind the scenes.  It's assigned when the account is created, and scripts and the servers use it, rather than the name, to reference avatars.

Unless you're a scripter, or maybe filling out a configuration card for a security orb or similar to use as an access list, you don't really need to worry about them.