ircII help: whois

Usage: WHOIS <nickname>
       WHOIS <nick1>,<nick2> [...]
       WHOIS <server> <nickname>[,<nick2>...]
  Shows more detailed information about the nickname specified.
  This info includes the users name, host, server, "real" name,
  and away message.  As you can see in the second line you can
  use WHOIS on multiple nicknames. The third line demonstrates
  how you can send the WHOIS request to a distant server. If
  you WHOIS a person on his server you will receive extra info
  about his idle time.
    WHOIS nickname nickname
  where the two nicknames are the same will query the user's server
  about his information just like the WHOIS <server> <nickname> form.

See Also:
  WHOWAS