1 FINGER
Finger is a "SHOW SYSTEM" like program with options to provide :

$ FINGER
    "Show System"-like output, showing the personal name, executing
    program, and other information for all users currently logged in.

$ FINGER username
    Detailed information about a specified user including the contents
    of the user's FINGER.PLN file (if the user has one) and the status
    of the user's mailbox.  In addition, if the user is logged in, the
    session information is displayed.

$ FINGER personalname
    Finger will look up the user ID of a person whose name you know.

$ FINGER         @node
    Finger information at a DECnet or BITNET node, if the remote node runs
    a compatible version of FINGER.

Finger is a non-DEC product.  See HELP @LIB FINGER for more information.
