Hi Erik ----

>It takes an email address or domain/username and returns information from the server about whether the person is logged on or not, and depending on the server, more information about the user. Used to use it at school on the VAX.

Yup. It was one way to out information on a user back when a lot of the 'net was not-GUI.

For more info:

http://www.emailman.com/finger/