The finger protocol offers information regarding who is currently logged onto the computer. If a user is not specified then the server responds with a list of users logged onto the box. If a user is specified then information regarding the user is offered, given that the user is active.
To use the tool, enter the server and the user (if desired) then click the Go button. Advanced options include the Time-Out in seconds. You can specify the port queried, which is usually 79. There is a Verbose option that will often offer additional information. The last advanced option is the Results Font. The RFC for this protocol implies that text art (the use of ascii characters to make pictures) should be supported. This can only be done with a fixed width font (font where all characters are the same width). Most default operating systems fonts are not. The default font for this is set to Courier, but the option to select any installed font is offered through a dropdown box.